90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// 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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"bufio"
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"crypto/rand"
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"encoding/base32"
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"encoding/binary"
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"io"
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"sync"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
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)
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var (
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// crand provides buffered reads of random input.
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crand = bufio.NewReader(rand.Reader)
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mrand sync.Mutex
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// base32enc is a base 32 encoding based on a human-readable character set (no padding).
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base32enc = base32.NewEncoding("0123456789abcdefghjkmnpqrstvwxyz").WithPadding(-1)
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)
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// generateID generates a new ID string.
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func generateID() string {
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// 0:8 = timestamp
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// 8:12 = entropy
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//
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// inspired by ULID.
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b := make([]byte, 12)
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// Get current time in milliseconds.
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ms := uint64(time.Now().UnixMilli())
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// Store binary time data in byte buffer.
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binary.LittleEndian.PutUint64(b[0:8], ms)
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mrand.Lock()
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// Read random bits into buffer end.
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_, _ = io.ReadFull(crand, b[8:12])
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mrand.Unlock()
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// Encode the binary time+entropy ID.
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return base32enc.EncodeToString(b)
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}
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// AddRequestID returns a gin middleware which adds a unique ID to each request (both response header and context).
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func AddRequestID(header string) gin.HandlerFunc {
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return func(c *gin.Context) {
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// Look for existing ID.
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id := c.GetHeader(header)
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if id == "" {
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// Generate new ID.
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//
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// 0:8 = timestamp
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// 8:12 = entropy
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id = generateID()
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// Set the request ID in the req header in case we pass the request along
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// to another service
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c.Request.Header.Set(header, id)
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}
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// Store request ID in new request context and set on gin ctx.
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ctx := gtscontext.SetRequestID(c.Request.Context(), id)
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c.Request = c.Request.WithContext(ctx)
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// Set the request ID in the rsp header.
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c.Writer.Header().Set(header, id)
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}
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}
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