LICENSE

GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007

Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>

Everyone is permitted to copy and distribute verbatim copies of this license doc
ument, but changing it is not allowed.

Preamble

The GNU Affero General Public License is a free, copyleft license for software a
nd other kinds of works, specifically designed to ensure cooperation with the co
mmunity in the case of network server software.

The licenses for most software and other practical works are designed to take aw
ay your freedom to share and change the works. By contrast, our General Public L
icenses 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 Gene
ral Public Licenses are designed to make sure that you have the freedom to distr
ibute copies of free software (and charge for them if you wish), that you receiv
e 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 ste
ps: (1) assert copyright on the software, and (2) offer you this License which g
ives 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 avail
able for other developers to incorporate. Many developers of free software are h
eartened and encouraged by the resulting cooperation. However, in the case of so
ftware used on network servers, this result may fail to come about. The GNU Gene
ral Public License permits making a modified version and letting the public acce
ss 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, i
n such cases, the modified source code becomes available to the community. It re
quires the operator of a network server to provide the source code of the modifi
ed 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 t
he source code of the modified version.

An older license, called the Affero General Public License and published by Affe
ro, 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 foll
ow.

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 work
s, 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 individ
uals 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
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ropagation 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 netwo
rk, with no transfer of a copy, is not conveying.

    An interactive user interface displays "Appropriate Legal Notices" to the ex
tent that it includes a convenient and prominently visible feature that (1) disp
lays an appropriate copyright notice, and (2) tells the user that there is no wa
rranty for the work (except to the extent that warranties are provided), that li
censees may convey the work under this License, and how to view a copy of this L
icense. 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.

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d defined by a recognized standards body, or, in the case of interfaces specifie
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e 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
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terface for which an implementation is available to the public in source code fo
rm. A "Major Component", in this context, means a major essential component (ker
nel, window system, and so on) of the specific operating system (if any) on whic
h the executable work runs, or a compiler used to produce the work, or an object
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    The "Corresponding Source" for a work in object code form means all the sour
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ever, it does not include the work's System Libraries, or general-purpose tools 
or generally available free programs which are used unmodified in performing tho
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rce includes interface definition files associated with source files for the wor
k, and the source code for shared libraries and dynamically linked subprograms t
hat the work is specifically designed to require, such as by intimate data commu
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    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.
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    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 Prog
ram. The output from running a covered work is covered by this License only if t
he output, given its content, constitutes a covered work. This License acknowled
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covered works to others for the sole purpose of having them make modifications e
xclusively for you, or provide you with facilities for running those works, prov
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r which you do not control copyright. Those thus making or running the covered w
orks for you must do so exclusively on your behalf, under your direction and con
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isclaim 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 f
orbid circumvention of technological measures.
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ach copy an appropriate copyright notice; keep intact all notices stating that t
his License and any non-permissive terms added in accord with section 7 apply to
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recipients a copy of this License along with the Program.

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may offer support or warranty protection for a fee.
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it from the Program, in the form of source code under the terms of section 4, pr
ovided that you also meet all of these conditions:
        a) The work must carry prominent notices stating that you modified it, a
nd giving a relevant date.
        b) The work must carry prominent notices stating that it is released und
er this License and any conditions added under section 7. This requirement modif
ies the requirement in section 4 to "keep intact all notices".
        c) You must license the entire work, as a whole, under this License to a
nyone who comes into possession of a copy. This License will therefore apply, al
ong with any applicable section 7 additional terms, to the whole of the work, an
d all its parts, regardless of how they are packaged. This License gives no perm
ission to license the work in any other way, but it does not invalidate such per
mission if you have separately received it.
        d) If the work has interactive user interfaces, each must display Approp
riate Legal Notices; however, if the Program has interactive interfaces that do 
not display Appropriate Legal Notices, your work need not make them do so.

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hich are not by their nature extensions of the covered work, and which are not c
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 or distribution medium, is called an "aggregate" if the compilation and its res
ulting copyright are not used to limit the access or legal rights of the compila
tion's users beyond what the individual works permit. Inclusion of a covered wor
k in an aggregate does not cause this License to apply to the other parts of the
 aggregate.
    6. Conveying Non-Source Forms.
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s 4 and 5, provided that you also convey the machine-readable Corresponding Sour
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ing a physical distribution medium), accompanied by the Corresponding Source fix
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        b) Convey the object code in, or embodied in, a physical product (includ
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t least three years and valid for as long as you offer spare parts or customer s
upport for that product model, to give anyone who possesses the object code eith
er (1) a copy of the Corresponding Source for all the software in the product th
at 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 physical
ly 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 writte
n offer to provide the Corresponding Source. This alternative is allowed only oc
casionally and noncommercially, and only if you received the object code with su
ch an offer, in accord with subsection 6b.
        d) Convey the object code by offering access from a designated place (gr
atis or for a charge), and offer equivalent access to the Corresponding Source i
n 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 equiva
lent copying facilities, provided you maintain clear directions next to the obje
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able 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 ar
e 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 t
he Corresponding Source as a System Library, need not be included in conveying t
he object code work.

    A "User Product" is either (1) a "consumer product", which means any tangibl
e personal property which is normally used for personal, family, or household pu
rposes, or (2) anything designed or sold for incorporation into a dwelling. In d
etermining whether a product is a consumer product, doubtful cases shall be reso
lved in favor of coverage. For a particular product received by a particular use
r, "normally used" refers to a typical or common use of that class of product, r
egardless of the status of the particular user or of the way in which the partic
ular user actually uses, or expects or is expected to use, the product. A produc
t is a consumer product regardless of whether the product has substantial commer
cial, industrial or non-consumer uses, unless such uses represent the only signi
ficant mode of use of the product.

    "Installation Information" for a User Product means any methods, procedures,
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s Corresponding Source. The information must suffice to ensure that the continue
d 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 specifi
cally for use in, a User Product, and the conveying occurs as part of a transact
ion 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 transa
ction is characterized), the Corresponding Source conveyed under this section mu
st be accompanied by the Installation Information. But this requirement does not
 apply if neither you nor any third party retains the ability to install modifie
d object code on the User Product (for example, the work has been installed in R
OM).

    The requirement to provide Installation Information does not include a requi
rement to continue to provide support service, warranty, or updates for a work t
hat 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 ne
twork or violates the rules and protocols for communication across the network.

    Corresponding Source conveyed, and Installation Information provided, in acc
ord 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 permi
ssions may be written to require their own removal in certain cases when you mod
ify 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
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    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 materia
l) 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 autho
r attributions in that material or in the Appropriate Legal Notices displayed by
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        c) Prohibiting misrepresentation of the origin of that material, or requ
iring that modified versions of such material be marked in reasonable ways as di
fferent from the original version; or
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ors of the material; or
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ames, trademarks, or service marks; or
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y anyone who conveys the material (or modified versions of it) with contractual 
assumptions of liability to the recipient, for any liability that these contract
ual assumptions directly impose on those licensors and authors.

    All other non-permissive additional terms are considered "further restrictio
ns" 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 licens
e document contains a further restriction but permits relicensing or conveying u
nder 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 pla
ce, 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 a
pply 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 pate
nt 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) per
manently, if the copyright holder fails to notify you of the violation by some r
easonable means prior to 60 days after the cessation.

    Moreover, your license from a particular copyright holder is reinstated perm
anently 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 Lic
ense (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 license
s 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 qual
ify 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 cop
y 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 n
ot require acceptance. However, nothing other than this License grants you permi
ssion to propagate or modify any covered work. These actions infringe copyright 
if you do not accept this License. Therefore, by modifying or propagating a cove
red 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, sub
ject 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 organiza
tion, or substantially all assets of one, or subdividing an organization, or mer
ging organizations. If propagation of a covered work results from an entity tran
saction, each party to that transaction who receives a copy of the work also rec
eives whatever licenses to the work the party's predecessor in interest had or c
ould give under the previous paragraph, plus a right to possession of the Corres
ponding 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 gr
anted 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, sellin
g, 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 i
s called the contributor's "contributor version".

    A contributor's "essential patent claims" are all patent claims owned or con
trolled 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 inf
ringed only as a consequence of further modification of the contributor version.
 For purposes of this definition, "control" includes the right to grant patent s
ublicenses 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, off
er 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 agreeme
nt or commitment, however denominated, not to enforce a patent (such as an expre
ss permission to practice a patent or covenant not to s ue for patent infringeme
nt). 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 c
harge 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 Cor
responding 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 man
ner 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 infrin
ge one or more identifiable patents in that country that you have reason to beli
eve are valid.

    If, pursuant to or in connection with a single transaction or arrangement, y
ou 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 the
m 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-exerci
se 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 ma
ke 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 woul
d receive the covered work from you, a discriminatory patent license (a) in conn
ection with copies of the covered work conveyed by you (or copies made from thos
e copies), or (b) primarily for and in connection with specific products or comp
ilations 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 impl
ied 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 other
wise) that contradict the conditions of this License, they do not excuse you fro
m the conditions of this License. If you cannot convey a covered work so as to s
atisfy simultaneously your obligations under this License and any other pertinen
t obligations, then as a consequence you may
    not convey it at all. For example, if you agree to terms that obligate you t
o collect a royalty for further conveying from those to whom you convey the Prog
ram, the only way you could satisfy both those terms and this License would be t
o 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 Progr
am, your modified version must prominently offer all users interacting with it r
emotely through a computer network (if your version supports such interaction) a
n opportunity to receive the Corresponding Source of your version by providing a
ccess to the Corresponding Source from a network server at no charge, through so
me standard or customary means of facilitating copying of software. This Corresp
onding Source shall include the Corresponding Source for any work covered by ver
sion 3 of the GNU General Public License that is incorporated pursuant to the fo
llowing 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 ve
rsion 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 s
imilar 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 specif
ies 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 an
d conditions either of that numbered version or of any later version published b
y 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 publi
shed by the Free Software Foundation.

    If the Program specifies that a proxy can decide which future versions of th
e GNU Affero General Public License can be used, that proxy's public statement o
f acceptance of a version permanently authorizes you to choose that version for 
the Program.

    Later license versions may give you additional or different permissions. How
ever, 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 EXPRESS
ED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT
ABILITY 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 A
NY 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 I
NACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRA
M TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BE
EN 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 can
not 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 lia
bility 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 e
veryone can redistribute and change under these terms.

To do so, attach the following notices to the program. It is safest to attach th
em to the start of each source file to most effectively state the exclusion of w
arranty; and each file should have at least the "copyright" line and a pointer t
o where the full notice is found.

OAuth2AuthCodePKCE
Copyright (C) 2019 Bity SA

This program is free software: you can redistribute it and/or modify it under th
e terms of the GNU Affero General Public License as published by the Free Softwa
re Foundation, either version 3 of the License, or (at your option) any later ve
rsion.

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 w
ith this program. If not, see <https://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, yo
u 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 "So
urce" link that leads users to an archive of the code. There are many ways you c
ould 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 an
y, to sign a "copyright disclaimer" for the program, if necessary. For more info
rmation on this, and how to apply and follow the GNU AGPL, see <https://www.gnu.
org/licenses/>.