135 lines
3.9 KiB
Go
135 lines
3.9 KiB
Go
// Copyright 2022, 2023 The Forgejo & Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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// TODO: Think about whether this should be moved to services/actifitypub (compare to exosy/services/activitypub/client.go)
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package activitypub
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import (
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"bytes"
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"context"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"net/http"
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"strings"
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"time"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/proxy"
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"code.gitea.io/gitea/modules/setting"
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"github.com/go-fed/httpsig"
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)
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const (
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// ActivityStreamsContentType const
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ActivityStreamsContentType = `application/ld+json; profile="https://www.w3.org/ns/activitystreams"`
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httpsigExpirationTime = 60
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)
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// Gets the current time as an RFC 2616 formatted string
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// RFC 2616 requires RFC 1123 dates but with GMT instead of UTC
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func CurrentTime() string {
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return strings.ReplaceAll(time.Now().UTC().Format(time.RFC1123), "UTC", "GMT")
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}
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func containsRequiredHTTPHeaders(method string, headers []string) error {
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var hasRequestTarget, hasDate, hasDigest bool
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for _, header := range headers {
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hasRequestTarget = hasRequestTarget || header == httpsig.RequestTarget
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hasDate = hasDate || header == "Date"
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hasDigest = hasDigest || header == "Digest"
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}
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if !hasRequestTarget {
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return fmt.Errorf("missing http header for %s: %s", method, httpsig.RequestTarget)
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} else if !hasDate {
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return fmt.Errorf("missing http header for %s: Date", method)
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} else if !hasDigest && method != http.MethodGet {
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return fmt.Errorf("missing http header for %s: Digest", method)
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}
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return nil
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}
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// Client struct
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type Client struct {
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client *http.Client
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algs []httpsig.Algorithm
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digestAlg httpsig.DigestAlgorithm
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getHeaders []string
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postHeaders []string
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priv *rsa.PrivateKey
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pubID string
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}
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// NewClient function
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func NewClient(ctx context.Context, user *user_model.User, pubID string) (c *Client, err error) {
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if err = containsRequiredHTTPHeaders(http.MethodGet, setting.Federation.GetHeaders); err != nil {
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return nil, err
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} else if err = containsRequiredHTTPHeaders(http.MethodPost, setting.Federation.PostHeaders); err != nil {
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return nil, err
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}
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priv, err := GetPrivateKey(ctx, user)
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if err != nil {
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return nil, err
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}
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privPem, _ := pem.Decode([]byte(priv))
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privParsed, err := x509.ParsePKCS1PrivateKey(privPem.Bytes)
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if err != nil {
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return nil, err
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}
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c = &Client{
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client: &http.Client{
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Transport: &http.Transport{
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Proxy: proxy.Proxy(),
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},
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},
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algs: setting.HttpsigAlgs,
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digestAlg: httpsig.DigestAlgorithm(setting.Federation.DigestAlgorithm),
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getHeaders: setting.Federation.GetHeaders,
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postHeaders: setting.Federation.PostHeaders,
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priv: privParsed,
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pubID: pubID,
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}
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return c, err
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}
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// NewRequest function
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func (c *Client) NewRequest(method string, b []byte, to string) (req *http.Request, err error) {
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buf := bytes.NewBuffer(b)
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req, err = http.NewRequest(method, to, buf)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Content-Type", ActivityStreamsContentType)
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req.Header.Add("Date", CurrentTime())
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req.Header.Add("User-Agent", "Gitea/"+setting.AppVer)
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signer, _, err := httpsig.NewSigner(c.algs, c.digestAlg, c.postHeaders, httpsig.Signature, httpsigExpirationTime)
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if err != nil {
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return nil, err
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}
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err = signer.SignRequest(c.priv, c.pubID, req, b)
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return req, err
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}
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// Post function
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func (c *Client) Post(b []byte, to string) (resp *http.Response, err error) {
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var req *http.Request
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if req, err = c.NewRequest(http.MethodPost, b, to); err != nil {
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return nil, err
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}
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resp, err = c.client.Do(req)
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return resp, err
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}
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// Create an http GET request with forgejo/gitea specific headers
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func (c *Client) Get(b []byte, to string) (resp *http.Response, err error) {
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var req *http.Request
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if req, err = c.NewRequest(http.MethodGet, b, to); err != nil {
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return nil, err
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}
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resp, err = c.client.Do(req)
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return resp, err
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}
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