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version=0.28.1
assignment-operator=end-line
break-cases=fit
break-fun-decl=wrap
break-fun-sig=wrap
break-infix=wrap
break-infix-before-func=false
break-separators=before
break-sequences=true
cases-exp-indent=2
cases-matching-exp-indent=normal
doc-comments=before
doc-comments-padding=2
doc-comments-tag-only=default
dock-collection-brackets=false
exp-grouping=preserve
field-space=loose
if-then-else=compact
indicate-multiline-delimiters=space
indicate-nested-or-patterns=unsafe-no
infix-precedence=indent
leading-nested-match-parens=false
let-and=sparse
let-binding-spacing=compact
let-module=compact
margin=80
max-indent=2
module-item-spacing=sparse
ocaml-version=4.14.0
ocp-indent-compat=false
parens-ite=false
parens-tuple=always
parse-docstrings=true
sequence-blank-line=preserve-one
sequence-style=terminator
single-case=compact
space-around-arrays=true
space-around-lists=true
space-around-records=true
space-around-variants=true
type-decl=sparse
wrap-comments=false
wrap-fun-args=true

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## unreleased

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GNU Affero General Public License
=================================
_Version 3, 19 November 2007_
_Copyright © 2007 Free Software Foundation, Inc. &lt;<http://fsf.org/>&gt;_
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
## Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
our General Public Licenses are intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
Developers that use our General Public Licenses protect your rights
with two steps: **(1)** assert copyright on the software, and **(2)** offer
you this License which gives you legal permission to copy, distribute
and/or modify the software.
A secondary benefit of defending all users' freedom is that
improvements made in alternate versions of the program, if they
receive widespread use, become available for other developers to
incorporate. Many developers of free software are heartened and
encouraged by the resulting cooperation. However, in the case of
software used on network servers, this result may fail to come about.
The GNU General Public License permits making a modified version and
letting the public access it on a server without ever releasing its
source code to the public.
The GNU Affero General Public License is designed specifically to
ensure that, in such cases, the modified source code becomes available
to the community. It requires the operator of a network server to
provide the source code of the modified version running there to the
users of that server. Therefore, public use of a modified version, on
a publicly accessible server, gives the public access to the source
code of the modified version.
An older license, called the Affero General Public License and
published by Affero, was designed to accomplish similar goals. This is
a different license, not a version of the Affero GPL, but Affero has
released a new version of the Affero GPL which permits relicensing under
this license.
The precise terms and conditions for copying, distribution and
modification follow.
## TERMS AND CONDITIONS
### 0. Definitions
“This License” refers to version 3 of the GNU Affero General Public License.
“Copyright” also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
“The Program” refers to any copyrightable work licensed under this
License. Each licensee is addressed as “you”. “Licensees” and
“recipients” may be individuals or organizations.
To “modify” a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a “modified version” of the
earlier work or a work “based on” the earlier work.
A “covered work” means either the unmodified Program or a work based
on the Program.
To “propagate” a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To “convey” a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays “Appropriate Legal Notices”
to the extent that it includes a convenient and prominently visible
feature that **(1)** displays an appropriate copyright notice, and **(2)**
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
### 1. Source Code
The “source code” for a work means the preferred form of the work
for making modifications to it. “Object code” means any non-source
form of a work.
A “Standard Interface” means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The “System Libraries” of an executable work include anything, other
than the work as a whole, that **(a)** is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and **(b)** serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form. A
“Major Component”, in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.
The “Corresponding Source” for a work in object code form means all
the source code needed to generate, install, and (for an executable
work) run the object code and to modify the work, including scripts to
control those activities. However, it does not include the work's
System Libraries, or general-purpose tools or generally available free
programs which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding Source
includes interface definition files associated with source files for
the work, and the source code for shared libraries and dynamically
linked subprograms that the work is specifically designed to require,
such as by intimate data communication or control flow between those
subprograms and other parts of the work.
The Corresponding Source need not include anything that users
can regenerate automatically from other parts of the Corresponding
Source.
The Corresponding Source for a work in source code form is that
same work.
### 2. Basic Permissions
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the stated
conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a
covered work is covered by this License only if the output, given its
content, constitutes a covered work. This License acknowledges your
rights of fair use or other equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do not
convey, without conditions so long as your license otherwise remains
in force. You may convey covered works to others for the sole purpose
of having them make modifications exclusively for you, or provide you
with facilities for running those works, provided that you comply with
the terms of this License in conveying all material for which you do
not control copyright. Those thus making or running the covered works
for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely under
the conditions stated below. Sublicensing is not allowed; section 10
makes it unnecessary.
### 3. Protecting Users' Legal Rights From Anti-Circumvention Law
No covered work shall be deemed part of an effective technological
measure under any applicable law fulfilling obligations under article
11 of the WIPO copyright treaty adopted on 20 December 1996, or
similar laws prohibiting or restricting circumvention of such
measures.
When you convey a covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing, against the work's
users, your or third parties' legal rights to forbid circumvention of
technological measures.
### 4. Conveying Verbatim Copies
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
### 5. Conveying Modified Source Versions
You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:
* **a)** The work must carry prominent notices stating that you modified
it, and giving a relevant date.
* **b)** The work must carry prominent notices stating that it is
released under this License and any conditions added under section 7.
This requirement modifies the requirement in section 4 to
“keep intact all notices”.
* **c)** You must license the entire work, as a whole, under this
License to anyone who comes into possession of a copy. This
License will therefore apply, along with any applicable section 7
additional terms, to the whole of the work, and all its parts,
regardless of how they are packaged. This License gives no
permission to license the work in any other way, but it does not
invalidate such permission if you have separately received it.
* **d)** If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your
work need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
“aggregate” if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
### 6. Conveying Non-Source Forms
You may convey a covered work in object code form under the terms
of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
in one of these ways:
* **a)** Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by the
Corresponding Source fixed on a durable physical medium
customarily used for software interchange.
* **b)** Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by a
written offer, valid for at least three years and valid for as
long as you offer spare parts or customer support for that product
model, to give anyone who possesses the object code either **(1)** a
copy of the Corresponding Source for all the software in the
product that is covered by this License, on a durable physical
medium customarily used for software interchange, for a price no
more than your reasonable cost of physically performing this
conveying of source, or **(2)** access to copy the
Corresponding Source from a network server at no charge.
* **c)** Convey individual copies of the object code with a copy of the
written offer to provide the Corresponding Source. This
alternative is allowed only occasionally and noncommercially, and
only if you received the object code with such an offer, in accord
with subsection 6b.
* **d)** Convey the object code by offering access from a designated
place (gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to
copy the object code is a network server, the Corresponding Source
may be on a different server (operated by you or a third party)
that supports equivalent copying facilities, provided you maintain
clear directions next to the object code saying where to find the
Corresponding Source. Regardless of what server hosts the
Corresponding Source, you remain obligated to ensure that it is
available for as long as needed to satisfy these requirements.
* **e)** Convey the object code using peer-to-peer transmission, provided
you inform other peers where the object code and Corresponding
Source of the work are being offered to the general public at no
charge under subsection 6d.
A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.
A “User Product” is either **(1)** a “consumer product”, which means any
tangible personal property which is normally used for personal, family,
or household purposes, or **(2)** anything designed or sold for incorporation
into a dwelling. In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage. For a particular
product received by a particular user, “normally used” refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.
“Installation Information” for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source. The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.
If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information. But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed. Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.
Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.
### 7. Additional Terms
“Additional permissions” are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own
removal in certain cases when you modify the work.) You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.
Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:
* **a)** Disclaiming warranty or limiting liability differently from the
terms of sections 15 and 16 of this License; or
* **b)** Requiring preservation of specified reasonable legal notices or
author attributions in that material or in the Appropriate Legal
Notices displayed by works containing it; or
* **c)** Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
* **d)** Limiting the use for publicity purposes of names of licensors or
authors of the material; or
* **e)** Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
* **f)** Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified versions of
it) with contractual assumptions of liability to the recipient, for
any liability that these contractual assumptions directly impose on
those licensors and authors.
All other non-permissive additional terms are considered “further
restrictions” within the meaning of section 10. If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term. If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.
### 8. Termination
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated **(a)**
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and **(b)** permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
### 9. Acceptance Not Required for Having Copies
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
### 10. Automatic Licensing of Downstream Recipients
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An “entity transaction” is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
### 11. Patents
A “contributor” is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's “contributor version”.
A contributor's “essential patent claims” are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, “control” includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a “patent license” is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To “grant” such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either **(1)** cause the Corresponding Source to be so
available, or **(2)** arrange to deprive yourself of the benefit of the
patent license for this particular work, or **(3)** arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. “Knowingly relying” means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is “discriminatory” if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license **(a)** in connection with copies of the covered work
conveyed by you (or copies made from those copies), or **(b)** primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
### 12. No Surrender of Others' Freedom
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
### 13. Remote Network Interaction; Use with the GNU General Public License
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
supports such interaction) an opportunity to receive the Corresponding
Source of your version by providing access to the Corresponding Source
from a network server at no charge, through some standard or customary
means of facilitating copying of software. This Corresponding Source
shall include the Corresponding Source for any work covered by version 3
of the GNU General Public License that is incorporated pursuant to the
following paragraph.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the work with which it is combined will remain governed by version
3 of the GNU General Public License.
### 14. Revised Versions of this License
The Free Software Foundation may publish revised and/or new versions of
the GNU Affero General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU Affero General
Public License “or any later version” applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU Affero General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
### 15. Disclaimer of Warranty
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
### 16. Limitation of Liability
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
### 17. Interpretation of Sections 15 and 16
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
_END OF TERMS AND CONDITIONS_
## How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the “copyright” line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a “Source” link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a “copyright disclaimer” for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
&lt;<http://www.gnu.org/licenses/>&gt;.

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# Drame
[Drame] is an [OCaml] web framework.
## Installation
`drame` can be installed with [opam]:
```sh
opam install drame
```
If you don't have `opam`, you can install it following the [how to install opam] guide.
If you can't or don't want to use `opam`, consult the [opam file] for build instructions.
## About
- [LICENSE]
- [CHANGELOG]
[CHANGELOG]: ./CHANGES.md
[example]: ./example
[LICENSE]: ./LICENSE.md
[opam file]: ./drame.opam
[how to install opam]: https://opam.ocaml.org/doc/Install.html
[OCaml]: https://ocaml.org
[opam]: https://opam.ocaml.org
[drame]: https://forge.kumikode.org/kumikode/drame

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# This file is generated by dune, edit dune-project instead
opam-version: "2.0"
synopsis: "OCaml web framework"
description: "Drame is an OCaml web framework."
maintainer: ["pena <pena@kumikode.org>"]
authors: ["pena <pena@kumikode.org>"]
license: "AGPL-3.0-or-later"
tags: ["drame" "TODO" "TODO" "TODO" "TODO"]
homepage: "https://forge.kumikode.org/kumikode/drame"
bug-reports: "https://forge.kumikode.org/kumikode/drame/issues"
depends: [
"dune" {>= "3.0"}
"directories"
"h2"
"htmlit"
"httpcats"
"js_of_ocaml-compiler"
"miou"
"prelude"
"ptime"
"scfg"
"tyxml"
"uri"
"uuidm"
"ocaml" {>= "5.0.0"}
"odoc" {with-doc}
]
build: [
["dune" "subst"] {dev}
[
"dune"
"build"
"-p"
name
"-j"
jobs
"@install"
"@runtest" {with-test}
"@doc" {with-doc}
]
]
dev-repo: "git+https://forge.kumikode.org/kumikode/drame.git"

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(lang dune 3.0)
(implicit_transitive_deps false)
(name drame)
(license AGPL-3.0-or-later)
(authors "pena <pena@kumikode.org>")
(maintainers "pena <pena@kumikode.org>")
(source
(uri git+https://forge.kumikode.org/kumikode/drame.git))
(homepage https://forge.kumikode.org/kumikode/drame)
(bug_reports https://forge.kumikode.org/kumikode/drame/issues)
(generate_opam_files true)
(package
(name drame)
(synopsis "OCaml web framework")
(description "Drame is an OCaml web framework.")
(tags
(drame TODO TODO TODO TODO))
(depends
directories
h2
htmlit
httpcats
js_of_ocaml-compiler
miou
prelude
ptime
scfg
tyxml
uri
uuidm
(ocaml
(>= 5.0.0))))

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(executable
(name main)
(modules main)
(flags
(:standard -open Prelude))
(libraries drame fmt prelude scfg))

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open Drame
open Tyxml
open Tyxml.Html
module App_id = struct
let qualifier = "org"
let organization = "drame"
let application = "drame"
end
module Server = Server.Make (App_id)
let template_html (_request : Request.t) ~title ~body =
let styles =
List.map
(fun s -> link ~rel:[ `Stylesheet ] ~href:(Fmt.str "/assets/css/%s" s) ())
[ "style.css" ]
in
let head = head (Html.title title) styles in
let body = Html.body [ main [ h1 [ title ]; body ] ] in
let a = [ a_lang "en" ] in
let tyxml_doc = html ~a head body in
Html_doc.of_tyxml tyxml_doc
let hello =
let body = txt "How are you doing?" in
fun ~name ->
let title = Fmt.kstr txt "Hello %s!" name in
fun request ->
let doc = template_html request ~title ~body in
let content = Content.Html doc in
Ok content
let hello_q request =
let name = Request.query request "name" in
let name = Option.value name ~default:"World" in
let msg = Fmt.kstr txt "Hello %s!" name in
let doc = template_html request ~title:msg ~body:msg in
let content = Content.Html doc in
Ok content
let config =
let title = txt "Configuration" in
let body = Fmt.kstr txt "%a" Scfg.Pp.config Server.config in
fun request ->
let doc = template_html request ~title ~body in
let content = Content.Html doc in
Ok content
let not_found =
let title = txt "404 Not Found" in
let body = txt "Ooops :S" in
fun request ->
let content = template_html request ~title ~body in
Error (Status.Not_found, content)
let style =
let sheet =
{css|body {
color: #ebb2bf;
background-color: #0f1312;
}|css}
in
let content = Content.Unsafe { content = sheet; mimetype = Text_css } in
fun _request -> Ok content
let handler route =
Fmt.pr "[request] %a@\n" Route.pp route;
Fmt.flush Fmt.stdout ();
match route with
| [||] -> hello ~name:"World"
| [| "assets"; "css"; "style.css" |] -> style
| [| "config" |] -> config
| [| "hello"; name |] -> hello ~name
| [| "helloq" |] -> hello_q
| _ -> not_found
let () = Server.run ~handler

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{ pkgs ? import (builtins.fetchTarball {
url = "https://github.com/NixOS/nixpkgs/archive/master.tar.gz";
}) {}
}:
let
ocamlPackages = pkgs.ocaml-ng.ocamlPackages_5_4.overrideScope (self: super: {
htmlit = ocamlPackages.buildTopkgPackage rec {
pname = "htmlit";
version = "0.2.0";
minimalOCamlVersion = "4.14.0";
src = pkgs.fetchzip {
url = "https://erratique.ch/software/htmlit/releases/htmlit-${version}.tbz";
hash = "sha256-vE6XY7INMCwQztZqKhJaxpNF0o5+NeutJM5XobshClE=";
};
};
});
in
pkgs.mkShell {
nativeBuildInputs = with ocamlPackages; [
dune_3
findlib
merlin
ocaml
ocamlformat
odoc
];
buildInputs = with ocamlPackages; [
httpcats
js_of_ocaml-compiler
miou
ptime
htmlit
scfg
tyxml
uri
uuidm
directories
];
}

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type t =
(*
| Css of string Css.css
*)
| Html of Html_doc.t
| JavaScript of Js_of_ocaml_compiler.Javascript.program
| Txt of string
| Unsafe of
{ content : string
; mimetype : Mimetype.t
}
let to_mimetype = function
(* | Css _ -> Mimetype.Text_css *)
| Html _ -> Mimetype.Text_html
| JavaScript _ -> Mimetype.Text_javascript
| Txt _ -> Mimetype.Text_plain
| Unsafe { mimetype; _ } -> mimetype

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type t =
(*
| Css of string Css.css
*)
| Html of Html_doc.t
| JavaScript of Js_of_ocaml_compiler.Javascript.program
| Txt of string
| Unsafe of
{ content : string
; mimetype : Mimetype.t
}
val to_mimetype : t -> Mimetype.t

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let pair_of_string s =
let ss = String.split_on_char '=' s in
match ss with [ a; b ] -> Some (String.trim a, String.trim b) | _ -> None
let pairs_of_header header =
let ss = String.split_on_char ';' header in
List.filter_map pair_of_string ss
let all_cookies request =
let headers = Request.headers request "Cookie" in
List.concat_map pairs_of_header headers
let get ~decrypt:_ request id =
let path = Some "/" in
let secure = true in
let cookie_prefix =
if true then ""
else
match (path, secure) with
| Some "/", true -> "__Host-"
| _, true -> "__Secure-"
| _, _ -> ""
in
let name = Fmt.str "%s%s" cookie_prefix id in
let cookies = all_cookies request in
let v = List.find_opt (fun (name', _) -> String.equal name name') cookies in
Option.map snd v
let to_set_cookie ~max_age ~path name value =
let max_age =
match max_age with
| None -> ""
| Some seconds -> Fmt.str "; Max-Age=%.0f" (floor seconds)
in
let path =
match path with None -> "" | Some path -> Fmt.str "; Path=%s" path
in
let secure = if true then "" else "; Secure" in
let http_only = "; HttpOnly" in
let same_site = "; SameSite=Lax" in
Fmt.str "%s=%s%s%s%s%s%s" name value max_age path secure http_only same_site
let make_set_headers ~encrypt:(_ : bool) ~max_age ~key ~value =
let path = Some "/" in
let secure = true in
let cookie_prefix =
if true then ""
else
match (path, secure) with
| Some "/", true -> "__Host-"
| _, true -> "__Secure-"
| _, _ -> ""
in
let name = Fmt.str "%s%s" cookie_prefix key in
let set_cookie = to_set_cookie ~max_age ~path name value in
[ ("Set-Cookie", set_cookie) ]

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val get : decrypt:bool -> Request.t -> string -> string option
val make_set_headers :
encrypt:bool
-> max_age:float option
-> key:string
-> value:string
-> (string * string) list

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(library
(public_name drame)
(modules
content
cookie
form
handler
html_doc
meth
mimetype
request
response
route
server
session
status
syntax)
(libraries
bigstringaf
bstr
directories
fmt
fpath
h1
h2
httpcats
(re_export js_of_ocaml-compiler)
miou
miou.unix
prelude
ptime
ptime.clock.os
(re_export scfg)
(re_export tyxml)
(re_export tyxml.functor)
htmlit
unix
uri
uuidm)
(flags
(:standard -open Prelude)))

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let form request =
match Request.header request "Content-Type" with
| None -> Error "missing content type"
| Some content_type -> (
match String.split_on_char ';' content_type with
| "application/x-www-form-urlencoded" :: _tl ->
let body = request.get_body () in
let query = Uri.query_of_encoded body in
let form =
List.map (fun (name, values) -> (name, String.concat "," values)) query
in
Ok (List.sort (Pair.compare String.compare String.compare) form)
| _content_type -> Error "wrong content type" )

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val form : Request.t -> ((string * string) list, string) result

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type t = Route.t -> Request.t -> Response.t

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type t = Route.t -> Request.t -> Response.t

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type t = string
let to_string = Fun.id
let of_tyxml doc =
let indent = false in
Fmt.str "%a@\n" (Tyxml.Html.pp ~indent ()) doc
let of_htmlit doc = Htmlit.El.to_string ~doctype:true doc

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type t
val to_string : t -> string
val of_tyxml : Tyxml.Html.doc -> t
val of_htmlit : Htmlit.El.html -> t

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type t =
| Connect
| Delete
| Get
| Head
| Options
| Post
| Put
| Trace
| Other of string
let of_httpcats = function
| `CONNECT -> Connect
| `DELETE -> Delete
| `GET -> Get
| `HEAD -> Head
| `OPTIONS -> Options
| `POST -> Post
| `PUT -> Put
| `TRACE -> Trace
| `Other s -> Other s

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type t =
| Connect
| Delete
| Get
| Head
| Options
| Post
| Put
| Trace
| Other of string
val of_httpcats : H2.Method.t -> t

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type t =
| Audio_aac
| Audio_midi
| Audio_mp3
| Audio_wav
| Audio_weba
| Application_epub
| Application_json
| Application_jsonld
| Application_gz
| Application_tar
| Application_xml
| Application_atom_xml
| Application_zip
| Application_7z
| Image_bmp
| Image_jpeg
| Image_gif
| Image_ico
| Image_png
| Image_svg
| Image_webp
| Font_ttf
| Text_css
| Text_csv
| Text_html
| Text_javascript
| Text_plain
| Unsafe of string * bool
| Video_avi
| Video_mp4
| Video_webm
let pp fmt mimetype =
Fmt.string fmt
( match mimetype with
| Audio_aac -> "audio/aac"
| Audio_midi -> "audio/midi"
| Audio_mp3 -> "audio/mpeg"
| Audio_wav -> "audio/wav"
| Audio_weba -> "audio/webm"
| Application_epub -> "application/epub+zip"
| Application_json -> "application/json"
| Application_jsonld -> "application/ld+json"
| Application_gz -> "application/gzip"
| Application_tar -> "application/x-tar"
| Application_xml -> "application/xml"
| Application_atom_xml -> "application/atom+xml"
| Application_zip -> "application/zip"
| Application_7z -> "application/x-7z-compressed"
| Image_bmp -> "image/bmp"
| Image_jpeg -> "image/jpeg"
| Image_gif -> "image/gif"
| Image_ico -> "image/vnd.microsoft.icon"
| Image_png -> "image/png"
| Image_svg -> "image/svg+xml"
| Image_webp -> "image/webp"
| Font_ttf -> "font/ttf"
| Text_css -> "text/css;charset=utf-8"
| Text_csv -> "text/csv;charset=utf-8"
| Text_html -> "text/html;charset=utf-8"
| Text_javascript ->
(* setting a charset is invalid for JavaScript! *)
"text/javascript"
| Text_plain -> "text/plain;charset=utf-8"
| Unsafe (mimetype, _should_cache) -> mimetype
| Video_avi -> "video/x-msvideo"
| Video_mp4 -> "video/mp4"
| Video_webm -> "video/webm" )
let to_string mimetype = Fmt.str "%a" pp mimetype

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(* some common MIME types found on https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types *)
type t =
| Audio_aac
| Audio_midi
| Audio_mp3
| Audio_wav
| Audio_weba
| Application_epub
| Application_json
| Application_jsonld
| Application_gz
| Application_tar
| Application_xml
| Application_atom_xml
| Application_zip
| Application_7z
| Image_bmp
| Image_jpeg
| Image_gif
| Image_ico
| Image_png
| Image_svg
| Image_webp
| Font_ttf
| Text_css
| Text_csv
| Text_html
| Text_javascript
| Text_plain
| Unsafe of string * bool (* mime-type / should be cached *)
| Video_avi
| Video_mp4
| Video_webm
val pp : Format.formatter -> t -> unit
val to_string : t -> string

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type query = (string * string list) list
type headers = (string * string) list
type t =
{ route : Route.t
; meth : Meth.t
; query : query
; headers : headers
; get_body : unit -> string
}
let pp_comma fmt () = Fmt.char fmt ','
let pp_comma_sep_string_list = Fmt.list ~sep:pp_comma Fmt.string
let query_values_to_string query = Fmt.str "%a" pp_comma_sep_string_list query
let query { query; _ } name : string option =
let query = List.assoc_opt name query in
Option.map query_values_to_string query
let queries { query; _ } name : string list =
List.filter_map
(fun (name', values) ->
if String.equal name name' then
let values = query_values_to_string values in
Some values
else None )
query
let all_queries { query; _ } : (string * string) list =
List.map
(fun (name, values) ->
let values = query_values_to_string values in
(name, values) )
query
let header { headers; _ } name : string option =
let header =
List.find_opt (fun (name', _value) -> String.equal name name') headers
in
Option.map snd header
let headers { headers; _ } name : string list =
List.filter_map
(fun (name', value) -> if String.equal name name' then Some value else None)
headers
let all_headers { headers; _ } : (string * string) list = headers
let request_from_httpaf ~scheme { H1.Request.meth; target; headers; _ } =
let headers = H2.Headers.of_list (H1.Headers.to_list headers) in
Httpcats.Server.{ meth; target; scheme; headers }
let request_from_h2 { H2.Request.meth; target; scheme; headers } =
Httpcats.Server.{ meth; target; scheme; headers }
let request_of_reqd ~scheme reqd =
match reqd with
| `V1 reqd ->
let request = H1.Reqd.request reqd in
request_from_httpaf ~scheme request
| `V2 reqd ->
let request = H2.Reqd.request reqd in
request_from_h2 request
let get_body reqd =
let aux schedule close =
(* TODO implement a Bstr_buffer *)
let buf = Buffer.create 0x1000 in
let rec on_eof () = close ()
and on_read bs ~off ~len =
let s = Bstr.sub_string ~off ~len bs in
Buffer.add_string buf s;
schedule ~on_eof ~on_read
in
schedule ~on_eof ~on_read;
let body = Buffer.contents buf in
body
in
let aux' schedule close =
(* TODO implement a Bstr_buffer *)
let buf = Buffer.create 0x1000 in
let rec on_eof () = close ()
and on_read bs ~off ~len =
let s = Bigstringaf.substring ~off ~len bs in
Buffer.add_string buf s;
schedule ~on_eof ~on_read
in
schedule ~on_eof ~on_read;
let body = Buffer.contents buf in
body
in
match reqd with
| `V1 reqd ->
let body_reader = H1.Reqd.request_body reqd in
aux (H1.Body.Reader.schedule_read body_reader) (fun () ->
H1.Body.Reader.close body_reader )
| `V2 reqd ->
let body_reader = H2.Reqd.request_body reqd in
aux' (H2.Body.Reader.schedule_read body_reader) (fun () ->
H2.Body.Reader.close body_reader )
let of_reqd reqd =
let { Httpcats.Server.target; meth; headers; _ } =
request_of_reqd ~scheme:"https" reqd
in
let target = Uri.of_string target in
let query =
match Uri.verbatim_query target with
| None -> []
| Some query -> Uri.query_of_encoded query
in
let route = Uri.path target |> Route.of_string in
let headers = H2.Headers.to_list headers in
let meth = Meth.of_httpcats meth in
let get_body () = get_body reqd in
{ route; meth; query; headers; get_body }

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type query
type headers
type t = private
{ route : Route.t
; meth : Meth.t
; query : query
; headers : headers
; get_body : unit -> string
}
(** Queries *)
val query : t -> string -> string option
val queries : t -> string -> string list
val all_queries : t -> (string * string) list
(** Headers *)
val header : t -> string -> string option
val headers : t -> string -> string list
val all_headers : t -> (string * string) list
(** Internal *)
val of_reqd : Httpcats.Server.reqd -> t

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type t = (Content.t, Status.error * Html_doc.t) Result.t

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type t = (Content.t, Status.error * Html_doc.t) Result.t

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type t = string array
let pp fmt route =
Fmt.pf fmt "/%a"
(Fmt.array ~sep:(fun fmt () -> Fmt.char fmt '/') Fmt.string)
route
let of_string s =
let ss = String.split_on_char '/' s in
let ss = List.filter (fun s -> not (String.equal "" s)) ss in
Array.of_list ss

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type t = string array
val pp : Format.formatter -> t -> unit
val of_string : string -> t

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module Make (App_id : sig
val qualifier : string
val organization : string
val application : string
end) =
struct
module Project = struct
include Directories.Project_dirs (App_id)
let force_dir d name =
match d with
| None -> Fmt.failwith "can not compute %s directory path" name
| Some dir -> dir
let cache_dir = force_dir cache_dir "cache"
let config_dir = force_dir config_dir "config"
let data_dir = force_dir data_dir "data"
let data_local_dir = force_dir data_local_dir "data local"
let preference_dir = force_dir preference_dir "preference"
let runtime_dir = force_dir runtime_dir "runtime"
let state_dir = force_dir state_dir "state"
end
let config =
let filename = Fpath.(Project.config_dir / "config.scfg") in
match Scfg.Parse.from_file filename with
| Error (`Msg msg) -> Fmt.failwith "%s" msg
| Ok config -> config
open Scfg.Query
let port =
let directive = get_dir "port" config in
match directive with
| None -> Fmt.failwith "configuration file is missing a port directive"
| Some directive -> (
let param = get_param_int 0 directive in
match param with
| Error (`Msg msg) -> Fmt.failwith "%s" msg
| Ok port -> port )
let listen () =
let inet_addr = Unix.inet_addr_any in
let sockaddr = Unix.ADDR_INET (inet_addr, port) in
sockaddr
let stop = Httpcats.Server.stop ()
let prepare_content content =
let content_type = Content.to_mimetype content |> Mimetype.to_string in
let content =
match content with
(* | Content.Css sheet -> Fmt.str "%a@\n" Css.pp_string_css sheet *)
| Html doc -> Html_doc.to_string doc
| JavaScript program ->
let open Js_of_ocaml_compiler in
let accept_unnamed_var = true in
let buffer = Buffer.create 4096 in
let pp = Pretty_print.to_buffer buffer in
let _source_map : Source_map.info =
Js_output.program ~accept_unnamed_var pp program
in
(* setting a charset is invalid for JavaScript ! *)
Buffer.contents buffer
| Txt txt -> txt
| Unsafe { content; _ } -> content
in
let content_length = String.length content in
let headers =
[ ("content-type", content_type)
; ("content-length", string_of_int content_length)
]
in
(headers, content)
let status_of_response = function
| Ok _ -> `OK
| Error (status, _) -> Status.to_httpcats status
let status_headers_of_response = function
| Ok content -> begin
match Content.to_mimetype content with
| Audio_aac | Audio_midi | Audio_mp3 | Audio_wav | Audio_weba | Image_jpeg
| Image_png | Image_gif | Image_bmp | Image_ico | Image_svg | Image_webp
| Font_ttf | Text_css | Text_javascript
| Unsafe (_, true) ->
[ ("Cache-Control", "max-age=151200") ]
| Text_html | Text_plain
| Unsafe (_, false)
| Application_epub | Application_json | Application_jsonld
| Application_gz | Application_tar | Application_xml
| Application_atom_xml | Application_zip | Application_7z | Text_csv
| Video_avi | Video_mp4 | Video_webm ->
[]
end
| Error
( ( Status.See_other redirect
| Found redirect
| Moved_permanently redirect )
, _ ) ->
[ ("Location", redirect) ]
| Error _ -> []
let content_of_response = function
| Ok content -> content
| Error (_, content) -> Content.Html content
(* TODO :/ *)
let downgrade_status : Httpcats.Status.t -> H1.Status.t = function
| `Misdirected_request -> assert false
| `Code _ -> assert false
| #H1.Status.standard as t -> t
let respond reqd headers status content =
match reqd with
| `V1 reqd ->
let open H1 in
let headers = Headers.of_list headers in
let status = downgrade_status status in
let resp = Response.create ~headers status in
Reqd.respond_with_string reqd resp content
| `V2 reqd ->
let open H2 in
let headers = Headers.of_list headers in
let resp = Response.create ~headers status in
Reqd.respond_with_string reqd resp content
let mk_server ~(handler : Handler.t) =
let handler (_ : [ `Tcp of Miou_unix.file_descr | `Tls of _ ])
(reqd : Httpcats.Server.reqd) =
let ({ Request.route; _ } as request) = Request.of_reqd reqd in
let response = handler route request in
let status = status_of_response response in
let status_headers = status_headers_of_response response in
let content = content_of_response response in
let session = Session.load request in
let session_headers = Session.make_send_headers session in
let content_headers, content = prepare_content content in
let headers = session_headers @ content_headers @ status_headers in
respond reqd headers status content
in
let file_descr = listen () in
Httpcats.Server.clear ~stop ~handler file_descr;
()
let () = Sys.set_signal Sys.sigpipe Sys.Signal_ignore
let run ~(handler : Handler.t) =
let server () = mk_server ~handler in
Miou_unix.run server
end

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module Make (App_id : sig
val qualifier : string
val organization : string
val application : string
end) : sig
module Project : sig
val cache_dir : Fpath.t
val config_dir : Fpath.t
val data_dir : Fpath.t
val data_local_dir : Fpath.t
val preference_dir : Fpath.t
val runtime_dir : Fpath.t
val state_dir : Fpath.t
end
val config : Scfg.Types.config
val run : handler:Handler.t -> unit
end

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let random_state = Random.State.make_self_init ()
module Id = struct
type t = Uuidm.t
let create () =
(* TODO: use a CSPRNG *)
Uuidm.v4_gen random_state ()
let equal = Uuidm.equal
let hash (t : t) = Hashtbl.hash t
let of_string = Uuidm.of_string
let to_string = Uuidm.to_string ~upper:false
let pp = Uuidm.pp
end
type t =
{ id : Id.t
; mutable expires_at : Ptime.t
; mutable payload : (string * string) list
}
module Tbl : sig
val find : Id.t -> t option
val add : Id.t -> t -> unit
val remove : Id.t -> unit
end = struct
include Hashtbl.Make (Id)
let tbl = create 512
let mutex = Mutex.create ()
let finally () = Mutex.unlock mutex
let find key =
Mutex.lock mutex;
Fun.protect ~finally (fun () -> find_opt tbl key)
let add key value =
Mutex.lock mutex;
Fun.protect ~finally (fun () -> replace tbl key value)
let remove key =
Mutex.lock mutex;
Fun.protect ~finally (fun () -> remove tbl key)
end
let now () = Ptime.v (Ptime_clock.now_d_ps ())
let two_weeks =
match Ptime.Span.of_float_s (60. *. 60. *. 24. *. 7. *. 2.) with
| None -> assert false
| Some span -> span
let one_week =
match Ptime.Span.of_float_s (60. *. 60. *. 24. *. 7.) with
| None -> assert false
| Some span -> span
let create () =
let id = Id.create () in
let expires_at = Ptime.add_span (now ()) two_weeks in
let expires_at =
match expires_at with None -> assert false | Some expires_at -> expires_at
in
let payload = [] in
{ id; expires_at; payload }
let load request =
let now = now () in
let valid_session =
let session_id = Cookie.get ~decrypt:false request "drame.session" in
match session_id with
| None -> None
| Some session_id -> (
match Id.of_string session_id with
| None -> None
| Some session_id -> (
match Tbl.find session_id with
| None -> None
| Some { id; expires_at; _ } as session ->
let is_valid = Ptime.is_earlier now ~than:expires_at in
if is_valid then session
else begin
Tbl.remove id;
None
end ) )
in
match valid_session with
| None ->
let session = create () in
Tbl.add session.id session;
session
| Some ({ expires_at; _ } as session) ->
let renew_date =
match Ptime.sub_span expires_at one_week with
| None -> assert false
| Some span -> span
in
if Ptime.is_earlier now ~than:renew_date then session
else begin
let expires_at =
match Ptime.add_span now two_weeks with
| None -> assert false
| Some date -> date
in
session.expires_at <- expires_at;
session
end
let get request key =
let { payload; _ } = load request in
List.assoc_opt key payload
let set request key value =
let ({ payload; _ } as session) = load request in
let payload = List.remove_assoc key payload in
let payload = (key, value) :: payload in
session.payload <- payload
let drop request key =
let ({ payload; _ } as session) = load request in
let payload = List.remove_assoc key payload in
session.payload <- payload
let invalidate request =
let { id; _ } = load request in
Tbl.remove id
let make_send_headers session =
let value = Id.to_string session.id in
let max_age = Ptime.diff session.expires_at (now ()) in
let max_age = Option.some @@ Ptime.Span.to_float_s max_age in
Cookie.make_set_headers ~encrypt:false ~max_age ~key:"drame.session" ~value
let pp fmt request =
let { id; expires_at; payload } = load request in
Fmt.pf fmt "id = %a ; expires_at = %a ; payload:@\n @[<v>" Id.pp id Ptime.pp
expires_at;
Fmt.list
~sep:(fun fmt () -> Fmt.string fmt "@\n")
(fun fmt (k, v) -> Fmt.pf fmt "%s = %s" k v)
fmt payload;
Fmt.pf fmt "@]"

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type t
val load : Request.t -> t
val invalidate : Request.t -> unit
val get : Request.t -> string -> string option
val set : Request.t -> string -> string -> unit
val drop : Request.t -> string -> unit
val pp : Format.formatter -> Request.t -> unit
(* Internal *)
val make_send_headers : t -> (string * string) list

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type error =
| Moved_permanently of string
| Found of string
| See_other of string
| Bad_request
| Unauthorized
| Forbidden
| Not_found
| Request_timeout
| Too_many_requests
| Internal_server_error
| Not_implemented
| Bad_gateway
| Service_unavailable
| Gateway_timeout
let to_httpcats = function
| Moved_permanently _url -> `Moved_permanently
| Found _url -> `Found
| See_other _url -> `See_other
| Bad_request -> `Bad_request
| Unauthorized -> `Unauthorized
| Forbidden -> `Forbidden
| Not_found -> `Not_found
| Request_timeout -> `Request_timeout
| Too_many_requests -> `Enhance_your_calm
| Internal_server_error -> `Internal_server_error
| Not_implemented -> `Not_implemented
| Bad_gateway -> `Bad_gateway
| Service_unavailable -> `Service_unavailable
| Gateway_timeout -> `Gateway_timeout

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type error =
| Moved_permanently of string
| Found of string
| See_other of string
| Bad_request
| Unauthorized
| Forbidden
| Not_found
| Request_timeout
| Too_many_requests
| Internal_server_error
| Not_implemented
| Bad_gateway
| Service_unavailable
| Gateway_timeout
val to_httpcats : error -> Httpcats.Status.t

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let ( let* ) = Result.bind
let ( let+ ) r f = Result.map f r