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// Copyright 2016 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package context
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"code.gitea.io/gitea/models/unit"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/gitrepo"
"code.gitea.io/gitea/modules/httpcache"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/web"
web_types "code.gitea.io/gitea/modules/web/types"
)
// APIContext is a specific context for API service
type APIContext struct {
*Base
Cache cache.StringCache
Doer *user_model.User // current signed-in user
IsSigned bool
IsBasicAuth bool
ContextUser *user_model.User // the user which is being visited, in most cases it differs from Doer
Repo *Repository
Org *APIOrganization
Package *Package
}
func init() {
web.RegisterResponseStatusProvider[*APIContext](func(req *http.Request) web_types.ResponseStatusProvider {
return req.Context().Value(apiContextKey).(*APIContext)
})
}
// Currently, we have the following common fields in error response:
// * message: the message for end users (it shouldn't be used for error type detection)
// if we need to indicate some errors, we should introduce some new fields like ErrorCode or ErrorType
// * url: the swagger document URL
// APIError is error format response
// swagger:response error
type APIError struct {
Message string `json:"message"`
URL string `json:"url"`
}
// APIValidationError is error format response related to input validation
// swagger:response validationError
type APIValidationError struct {
Message string `json:"message"`
URL string `json:"url"`
}
// APIInvalidTopicsError is error format response to invalid topics
// swagger:response invalidTopicsError
type APIInvalidTopicsError struct {
Message string `json:"message"`
InvalidTopics []string `json:"invalidTopics"`
}
// APIEmpty is an empty response
// swagger:response empty
type APIEmpty struct{}
// APIForbiddenError is a forbidden error response
// swagger:response forbidden
type APIForbiddenError struct {
APIError
}
// APINotFound is a not found empty response
// swagger:response notFound
type APINotFound struct{}
// APIConflict is a conflict empty response
// swagger:response conflict
type APIConflict struct{}
// APIRedirect is a redirect response
// swagger:response redirect
type APIRedirect struct{}
// APIString is a string response
// swagger:response string
type APIString string
// APIRepoArchivedError is an error that is raised when an archived repo should be modified
// swagger:response repoArchivedError
type APIRepoArchivedError struct {
APIError
}
// ServerError responds with error message, status is 500
func (ctx *APIContext) ServerError(title string, err error) {
ctx.Error(http.StatusInternalServerError, title, err)
}
// Error responds with an error message to client with given obj as the message.
// If status is 500, also it prints error to log.
func (ctx *APIContext) Error(status int, title string, obj any) {
var message string
if err, ok := obj.(error); ok {
message = err.Error()
} else {
message = fmt.Sprintf("%s", obj)
}
if status == http.StatusInternalServerError {
log.ErrorWithSkip(1, "%s: %s", title, message)
if setting.IsProd && !(ctx.Doer != nil && ctx.Doer.IsAdmin) {
message = ""
}
}
ctx.JSON(status, APIError{
Message: message,
URL: setting.API.SwaggerURL,
})
}
// InternalServerError responds with an error message to the client with the error as a message
// and the file and line of the caller.
func (ctx *APIContext) InternalServerError(err error) {
log.ErrorWithSkip(1, "InternalServerError: %v", err)
var message string
if !setting.IsProd || (ctx.Doer != nil && ctx.Doer.IsAdmin) {
message = err.Error()
}
ctx.JSON(http.StatusInternalServerError, APIError{
Message: message,
URL: setting.API.SwaggerURL,
})
}
type apiContextKeyType struct{}
var apiContextKey = apiContextKeyType{}
// GetAPIContext returns a context for API routes
func GetAPIContext(req *http.Request) *APIContext {
return req.Context().Value(apiContextKey).(*APIContext)
}
func genAPILinks(curURL *url.URL, total, pageSize, curPage int) []string {
page := NewPagination(total, pageSize, curPage, 0)
paginater := page.Paginater
links := make([]string, 0, 4)
if paginater.HasNext() {
u := *curURL
queries := u.Query()
queries.Set("page", fmt.Sprintf("%d", paginater.Next()))
u.RawQuery = queries.Encode()
links = append(links, fmt.Sprintf("<%s%s>; rel=\"next\"", setting.AppURL, u.RequestURI()[1:]))
}
if !paginater.IsLast() {
u := *curURL
queries := u.Query()
queries.Set("page", fmt.Sprintf("%d", paginater.TotalPages()))
u.RawQuery = queries.Encode()
links = append(links, fmt.Sprintf("<%s%s>; rel=\"last\"", setting.AppURL, u.RequestURI()[1:]))
}
if !paginater.IsFirst() {
u := *curURL
queries := u.Query()
queries.Set("page", "1")
u.RawQuery = queries.Encode()
links = append(links, fmt.Sprintf("<%s%s>; rel=\"first\"", setting.AppURL, u.RequestURI()[1:]))
}
if paginater.HasPrevious() {
u := *curURL
queries := u.Query()
queries.Set("page", fmt.Sprintf("%d", paginater.Previous()))
u.RawQuery = queries.Encode()
links = append(links, fmt.Sprintf("<%s%s>; rel=\"prev\"", setting.AppURL, u.RequestURI()[1:]))
}
return links
}
// SetLinkHeader sets pagination link header by given total number and page size.
func (ctx *APIContext) SetLinkHeader(total, pageSize int) {
links := genAPILinks(ctx.Req.URL, total, pageSize, ctx.FormInt("page"))
if len(links) > 0 {
ctx.RespHeader().Set("Link", strings.Join(links, ","))
ctx.AppendAccessControlExposeHeaders("Link")
}
}
// APIContexter returns apicontext as middleware
func APIContexter() func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
base, baseCleanUp := NewBaseContext(w, req)
ctx := &APIContext{
Base: base,
Cache: cache.GetCache(),
Repo: &Repository{PullRequest: &PullRequest{}},
Org: &APIOrganization{},
}
defer baseCleanUp()
ctx.Base.AppendContextValue(apiContextKey, ctx)
ctx.Base.AppendContextValueFunc(gitrepo.RepositoryContextKey, func() any { return ctx.Repo.GitRepo })
// If request sends files, parse them here otherwise the Query() can't be parsed and the CsrfToken will be invalid.
if ctx.Req.Method == "POST" && strings.Contains(ctx.Req.Header.Get("Content-Type"), "multipart/form-data") {
if err := ctx.Req.ParseMultipartForm(setting.Attachment.MaxSize << 20); err != nil && !strings.Contains(err.Error(), "EOF") { // 32MB max size
ctx.InternalServerError(err)
return
}
}
httpcache.SetCacheControlInHeader(ctx.Resp.Header(), 0, "no-transform")
ctx.Resp.Header().Set(`X-Frame-Options`, setting.CORSConfig.XFrameOptions)
next.ServeHTTP(ctx.Resp, ctx.Req)
})
}
}
// NotFound handles 404s for APIContext
// String will replace message, errors will be added to a slice
func (ctx *APIContext) NotFound(objs ...any) {
message := ctx.Locale.TrString("error.not_found")
var errors []string
for _, obj := range objs {
// Ignore nil
if obj == nil {
continue
}
if err, ok := obj.(error); ok {
errors = append(errors, err.Error())
} else {
message = obj.(string)
}
}
ctx.JSON(http.StatusNotFound, map[string]any{
"message": message,
"url": setting.API.SwaggerURL,
"errors": errors,
})
}
// ReferencesGitRepo injects the GitRepo into the Context
// you can optional skip the IsEmpty check
func ReferencesGitRepo(allowEmpty ...bool) func(ctx *APIContext) (cancel context.CancelFunc) {
return func(ctx *APIContext) (cancel context.CancelFunc) {
// Empty repository does not have reference information.
if ctx.Repo.Repository.IsEmpty && !(len(allowEmpty) != 0 && allowEmpty[0]) {
return nil
}
// For API calls.
if ctx.Repo.GitRepo == nil {
gitRepo, err := gitrepo.OpenRepository(ctx, ctx.Repo.Repository)
if err != nil {
ctx.Error(http.StatusInternalServerError, fmt.Sprintf("Open Repository %v failed", ctx.Repo.Repository.FullName()), err)
return cancel
}
ctx.Repo.GitRepo = gitRepo
// We opened it, we should close it
return func() {
// If it's been set to nil then assume someone else has closed it.
if ctx.Repo.GitRepo != nil {
_ = ctx.Repo.GitRepo.Close()
}
}
}
return cancel
}
}
// RepoRefForAPI handles repository reference names when the ref name is not explicitly given
func RepoRefForAPI(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := GetAPIContext(req)
if ctx.Repo.GitRepo == nil {
ctx.InternalServerError(fmt.Errorf("no open git repo"))
return
}
if ref := ctx.FormTrim("ref"); len(ref) > 0 {
commit, err := ctx.Repo.GitRepo.GetCommit(ref)
if err != nil {
if git.IsErrNotExist(err) {
ctx.NotFound()
} else {
ctx.Error(http.StatusInternalServerError, "GetCommit", err)
}
return
}
ctx.Repo.Commit = commit
ctx.Repo.CommitID = ctx.Repo.Commit.ID.String()
ctx.Repo.TreePath = ctx.Params("*")
next.ServeHTTP(w, req)
return
}
refName := getRefName(ctx.Base, ctx.Repo, RepoRefAny)
var err error
if ctx.Repo.GitRepo.IsBranchExist(refName) {
ctx.Repo.Commit, err = ctx.Repo.GitRepo.GetBranchCommit(refName)
if err != nil {
ctx.InternalServerError(err)
return
}
ctx.Repo.CommitID = ctx.Repo.Commit.ID.String()
} else if ctx.Repo.GitRepo.IsTagExist(refName) {
ctx.Repo.Commit, err = ctx.Repo.GitRepo.GetTagCommit(refName)
if err != nil {
ctx.InternalServerError(err)
return
}
ctx.Repo.CommitID = ctx.Repo.Commit.ID.String()
} else if len(refName) == ctx.Repo.GetObjectFormat().FullLength() {
ctx.Repo.CommitID = refName
ctx.Repo.Commit, err = ctx.Repo.GitRepo.GetCommit(refName)
if err != nil {
ctx.NotFound("GetCommit", err)
return
}
} else {
ctx.NotFound(fmt.Errorf("not exist: '%s'", ctx.Params("*")))
return
}
next.ServeHTTP(w, req)
})
}
// HasAPIError returns true if error occurs in form validation.
func (ctx *APIContext) HasAPIError() bool {
hasErr, ok := ctx.Data["HasError"]
if !ok {
return false
}
return hasErr.(bool)
}
// GetErrMsg returns error message in form validation.
func (ctx *APIContext) GetErrMsg() string {
msg, _ := ctx.Data["ErrorMsg"].(string)
if msg == "" {
msg = "invalid form data"
}
return msg
}
// NotFoundOrServerError use error check function to determine if the error
// is about not found. It responds with 404 status code for not found error,
// or error context description for logging purpose of 500 server error.
func (ctx *APIContext) NotFoundOrServerError(logMsg string, errCheck func(error) bool, logErr error) {
if errCheck(logErr) {
ctx.JSON(http.StatusNotFound, nil)
return
}
ctx.Error(http.StatusInternalServerError, "NotFoundOrServerError", logMsg)
}
// IsUserSiteAdmin returns true if current user is a site admin
func (ctx *APIContext) IsUserSiteAdmin() bool {
return ctx.IsSigned && ctx.Doer.IsAdmin
}
// IsUserRepoAdmin returns true if current user is admin in current repo
func (ctx *APIContext) IsUserRepoAdmin() bool {
return ctx.Repo.IsAdmin()
}
// IsUserRepoWriter returns true if current user has write privilege in current repo
func (ctx *APIContext) IsUserRepoWriter(unitTypes []unit.Type) bool {
for _, unitType := range unitTypes {
if ctx.Repo.CanWrite(unitType) {
return true
}
}
return false
}
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