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94 lines
3.2 KiB
94 lines
3.2 KiB
// GoToSocial |
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// Copyright (C) GoToSocial Authors admin@gotosocial.org |
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// SPDX-License-Identifier: AGPL-3.0-or-later |
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// |
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// This program is free software: you can redistribute it and/or modify |
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// it under the terms of the GNU Affero General Public License as published by |
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// the Free Software Foundation, either version 3 of the License, or |
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// (at your option) any later version. |
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// |
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// This program is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU Affero General Public License for more details. |
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// |
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// You should have received a copy of the GNU Affero General Public License |
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// along with this program. If not, see <http://www.gnu.org/licenses/>. |
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package middleware |
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import ( |
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"fmt" |
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"net/http" |
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"net/url" |
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"strings" |
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"github.com/gin-contrib/sessions" |
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"github.com/gin-contrib/sessions/memstore" |
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"github.com/gin-gonic/gin" |
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"github.com/superseriousbusiness/gotosocial/internal/config" |
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"github.com/superseriousbusiness/gotosocial/internal/log" |
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"golang.org/x/net/idna" |
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) |
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// SessionOptions returns the standard set of options to use for each session. |
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func SessionOptions() sessions.Options { |
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var samesite http.SameSite |
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switch strings.TrimSpace(strings.ToLower(config.GetAdvancedCookiesSamesite())) { |
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case "lax": |
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samesite = http.SameSiteLaxMode |
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case "strict": |
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samesite = http.SameSiteStrictMode |
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default: |
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log.Warnf(nil, "%s set to %s which is not recognized, defaulting to 'lax'", config.AdvancedCookiesSamesiteFlag(), config.GetAdvancedCookiesSamesite()) |
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samesite = http.SameSiteLaxMode |
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} |
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return sessions.Options{ |
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Path: "/", |
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Domain: config.GetHost(), |
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// 2 minutes |
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MaxAge: 120, |
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// only set secure over https |
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Secure: config.GetProtocol() == "https", |
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// forbid javascript from inspecting cookie |
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HttpOnly: true, |
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// https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-cookie-same-site-00#section-4.1.1 |
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SameSite: samesite, |
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} |
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} |
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// SessionName is a utility function that derives an appropriate session name from the hostname. |
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func SessionName() (string, error) { |
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// parse the protocol + host |
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protocol := config.GetProtocol() |
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host := config.GetHost() |
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u, err := url.Parse(fmt.Sprintf("%s://%s", protocol, host)) |
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if err != nil { |
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return "", err |
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} |
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// take the hostname without any port attached |
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strippedHostname := u.Hostname() |
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if strippedHostname == "" { |
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return "", fmt.Errorf("could not derive hostname without port from %s://%s", protocol, host) |
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} |
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// make sure IDNs are converted to punycode or the cookie library breaks: |
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// see https://en.wikipedia.org/wiki/Punycode |
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punyHostname, err := idna.New().ToASCII(strippedHostname) |
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if err != nil { |
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return "", fmt.Errorf("could not convert %s to punycode: %s", strippedHostname, err) |
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} |
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return fmt.Sprintf("gotosocial-%s", punyHostname), nil |
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} |
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// Session returns a new gin middleware that implements session cookies using the given |
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// sessionName, authentication key, and encryption key. Session name can be derived from the |
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// SessionName utility function in this package. |
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func Session(sessionName string, auth []byte, crypt []byte) gin.HandlerFunc { |
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store := memstore.NewStore(auth, crypt) |
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store.Options(SessionOptions()) |
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return sessions.Sessions(sessionName, store) |
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}
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