Skip to content

Instantly share code, notes, and snippets.

@tnishimura
Created February 13, 2022 13:02
Show Gist options
  • Save tnishimura/24b2d5aed8250c96a52b87e3a10e2c94 to your computer and use it in GitHub Desktop.
Save tnishimura/24b2d5aed8250c96a52b87e3a10e2c94 to your computer and use it in GitHub Desktop.
Giraffe.Antiforgery
// This file is a consolidated version of Giraffe.Antiforgery from
// https://github.com/pimbrouwers/Giraffe.Antiforgery, and is Copyright Pim Brouwers, licensed
// under Apache 2.0, which is included at the end of this file.
//
// I include it here because at the time of writing the blog post carpenoctem.dev/blog/fsharp-giraffe-auth-identity/ the
// package was out of date. It has slight modifications to comments.
module Giraffe.Antiforgery
open Microsoft.AspNetCore.Http
open Microsoft.AspNetCore.Antiforgery
open Giraffe
open Giraffe.ViewEngine
// This function calls `GetAndStoreTokens` to generate a anti-csrf token, create a cookie and store it in ctx.
// However, you probably won't use it too often -- favor csrfHtmlView instead
let csrfTokenizer (handler : AntiforgeryTokenSet -> HttpHandler) : HttpHandler =
fun (next: HttpFunc) (ctx : HttpContext) ->
let antiFrg = ctx.GetService<IAntiforgery>()
(antiFrg.GetAndStoreTokens ctx |> handler) next ctx
// Injects a newly generated CSRF token into a Giraffe.GiraffeViewEngine.XmlNode
// in order to use it, modify our view functions with an additional `token` parameter (it should be the last parameter)
// and then call csrfHtmlView instead of htmlView
let csrfHtmlView (view : AntiforgeryTokenSet -> XmlNode) : HttpHandler =
let handler token : HttpHandler =
fun (next: HttpFunc) (ctx : HttpContext) ->
htmlView (view token) next ctx
csrfTokenizer handler
// Checks the presence and validity of CSRF token and calls invalidTokenHandler on failure
// GET, HEAD, OPTIONS & TRACE always validate as true
let requiresCsrfToken (invalidTokenHandler : HttpHandler) : HttpHandler =
fun (next: HttpFunc) (ctx : HttpContext) ->
let antiFrg = ctx.GetService<IAntiforgery>()
(match antiFrg.IsRequestValidAsync(ctx) |> Async.AwaitTask |> Async.RunSynchronously with
| true -> next
| false -> invalidTokenHandler earlyReturn) ctx
let antiforgeryInput (token : AntiforgeryTokenSet) =
input [
_type "hidden"
_name token.FormFieldName
_value token.RequestToken
]
// Apache License
// Version 2.0, January 2004
// http://www.apache.org/licenses/
//
// TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
//
// 1. Definitions.
//
// "License" shall mean the terms and conditions for use, reproduction,
// and distribution as defined by Sections 1 through 9 of this document.
//
// "Licensor" shall mean the copyright owner or entity authorized by
// the copyright owner that is granting the License.
//
// "Legal Entity" shall mean the union of the acting entity and all
// other entities that control, are controlled by, or are under common
// control with that entity. For the purposes of this definition,
// "control" means (i) the power, direct or indirect, to cause the
// direction or management of such entity, whether by contract or
// otherwise, or (ii) ownership of fifty percent (50%) or more of the
// outstanding shares, or (iii) beneficial ownership of such entity.
//
// "You" (or "Your") shall mean an individual or Legal Entity
// exercising permissions granted by this License.
//
// "Source" form shall mean the preferred form for making modifications,
// including but not limited to software source code, documentation
// source, and configuration files.
//
// "Object" form shall mean any form resulting from mechanical
// transformation or translation of a Source form, including but
// not limited to compiled object code, generated documentation,
// and conversions to other media types.
//
// "Work" shall mean the work of authorship, whether in Source or
// Object form, made available under the License, as indicated by a
// copyright notice that is included in or attached to the work
// (an example is provided in the Appendix below).
//
// "Derivative Works" shall mean any work, whether in Source or Object
// form, that is based on (or derived from) the Work and for which the
// editorial revisions, annotations, elaborations, or other modifications
// represent, as a whole, an original work of authorship. For the purposes
// of this License, Derivative Works shall not include works that remain
// separable from, or merely link (or bind by name) to the interfaces of,
// the Work and Derivative Works thereof.
//
// "Contribution" shall mean any work of authorship, including
// the original version of the Work and any modifications or additions
// to that Work or Derivative Works thereof, that is intentionally
// submitted to Licensor for inclusion in the Work by the copyright owner
// or by an individual or Legal Entity authorized to submit on behalf of
// the copyright owner. For the purposes of this definition, "submitted"
// means any form of electronic, verbal, or written communication sent
// to the Licensor or its representatives, including but not limited to
// communication on electronic mailing lists, source code control systems,
// and issue tracking systems that are managed by, or on behalf of, the
// Licensor for the purpose of discussing and improving the Work, but
// excluding communication that is conspicuously marked or otherwise
// designated in writing by the copyright owner as "Not a Contribution."
//
// "Contributor" shall mean Licensor and any individual or Legal Entity
// on behalf of whom a Contribution has been received by Licensor and
// subsequently incorporated within the Work.
//
// 2. Grant of Copyright License. Subject to the terms and conditions of
// this License, each Contributor hereby grants to You a perpetual,
// worldwide, non-exclusive, no-charge, royalty-free, irrevocable
// copyright license to reproduce, prepare Derivative Works of,
// publicly display, publicly perform, sublicense, and distribute the
// Work and such Derivative Works in Source or Object form.
//
// 3. Grant of Patent License. Subject to the terms and conditions of
// this License, each Contributor hereby grants to You a perpetual,
// worldwide, non-exclusive, no-charge, royalty-free, irrevocable
// (except as stated in this section) patent license to make, have made,
// use, offer to sell, sell, import, and otherwise transfer the Work,
// where such license applies only to those patent claims licensable
// by such Contributor that are necessarily infringed by their
// Contribution(s) alone or by combination of their Contribution(s)
// with the Work to which such Contribution(s) was submitted. If You
// institute patent litigation against any entity (including a
// cross-claim or counterclaim in a lawsuit) alleging that the Work
// or a Contribution incorporated within the Work constitutes direct
// or contributory patent infringement, then any patent licenses
// granted to You under this License for that Work shall terminate
// as of the date such litigation is filed.
//
// 4. Redistribution. You may reproduce and distribute copies of the
// Work or Derivative Works thereof in any medium, with or without
// modifications, and in Source or Object form, provided that You
// meet the following conditions:
//
// (a) You must give any other recipients of the Work or
// Derivative Works a copy of this License; and
//
// (b) You must cause any modified files to carry prominent notices
// stating that You changed the files; and
//
// (c) You must retain, in the Source form of any Derivative Works
// that You distribute, all copyright, patent, trademark, and
// attribution notices from the Source form of the Work,
// excluding those notices that do not pertain to any part of
// the Derivative Works; and
//
// (d) If the Work includes a "NOTICE" text file as part of its
// distribution, then any Derivative Works that You distribute must
// include a readable copy of the attribution notices contained
// within such NOTICE file, excluding those notices that do not
// pertain to any part of the Derivative Works, in at least one
// of the following places: within a NOTICE text file distributed
// as part of the Derivative Works; within the Source form or
// documentation, if provided along with the Derivative Works; or,
// within a display generated by the Derivative Works, if and
// wherever such third-party notices normally appear. The contents
// of the NOTICE file are for informational purposes only and
// do not modify the License. You may add Your own attribution
// notices within Derivative Works that You distribute, alongside
// or as an addendum to the NOTICE text from the Work, provided
// that such additional attribution notices cannot be construed
// as modifying the License.
//
// You may add Your own copyright statement to Your modifications and
// may provide additional or different license terms and conditions
// for use, reproduction, or distribution of Your modifications, or
// for any such Derivative Works as a whole, provided Your use,
// reproduction, and distribution of the Work otherwise complies with
// the conditions stated in this License.
//
// 5. Submission of Contributions. Unless You explicitly state otherwise,
// any Contribution intentionally submitted for inclusion in the Work
// by You to the Licensor shall be under the terms and conditions of
// this License, without any additional terms or conditions.
// Notwithstanding the above, nothing herein shall supersede or modify
// the terms of any separate license agreement you may have executed
// with Licensor regarding such Contributions.
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor,
// except as required for reasonable and customary use in describing the
// origin of the Work and reproducing the content of the NOTICE file.
//
// 7. Disclaimer of Warranty. Unless required by applicable law or
// agreed to in writing, Licensor provides the Work (and each
// Contributor provides its Contributions) on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied, including, without limitation, any warranties or conditions
// of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
// PARTICULAR PURPOSE. You are solely responsible for determining the
// appropriateness of using or redistributing the Work and assume any
// risks associated with Your exercise of permissions under this License.
//
// 8. Limitation of Liability. In no event and under no legal theory,
// whether in tort (including negligence), contract, or otherwise,
// unless required by applicable law (such as deliberate and grossly
// negligent acts) or agreed to in writing, shall any Contributor be
// liable to You for damages, including any direct, indirect, special,
// incidental, or consequential damages of any character arising as a
// result of this License or out of the use or inability to use the
// Work (including but not limited to damages for loss of goodwill,
// work stoppage, computer failure or malfunction, or any and all
// other commercial damages or losses), even if such Contributor
// has been advised of the possibility of such damages.
//
// 9. Accepting Warranty or Additional Liability. While redistributing
// the Work or Derivative Works thereof, You may choose to offer,
// and charge a fee for, acceptance of support, warranty, indemnity,
// or other liability obligations and/or rights consistent with this
// License. However, in accepting such obligations, You may act only
// on Your own behalf and on Your sole responsibility, not on behalf
// of any other Contributor, and only if You agree to indemnify,
// defend, and hold each Contributor harmless for any liability
// incurred by, or claims asserted against, such Contributor by reason
// of your accepting any such warranty or additional liability.
//
// END OF TERMS AND CONDITIONS
//
// APPENDIX: How to apply the Apache License to your work.
//
// To apply the Apache License to your work, attach the following
// boilerplate notice, with the fields enclosed by brackets "[]"
// replaced with your own identifying information. (Don't include
// the brackets!) The text should be enclosed in the appropriate
// comment syntax for the file format. We also recommend that a
// file or class name and description of purpose be included on the
// same "printed page" as the copyright notice for easier
// identification within third-party archives.
//
// Copyright [yyyy] [name of copyright owner]
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
@brud
Copy link

brud commented Jul 30, 2022

I figured it out: I just only need to add services.AddAntiforgery() to configureServices

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment