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package request
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"path"
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"strings"
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"sync"
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model "github.com/cloudreve/Cloudreve/v3/models"
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"github.com/cloudreve/Cloudreve/v3/pkg/auth"
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"github.com/cloudreve/Cloudreve/v3/pkg/conf"
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"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
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"github.com/cloudreve/Cloudreve/v3/pkg/util"
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)
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// GeneralClient 通用 HTTP Client
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var GeneralClient Client = NewClient()
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// Response 请求的响应或错误信息
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type Response struct {
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Err error
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Response *http.Response
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}
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// Client 请求客户端
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type Client interface {
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Request(method, target string, body io.Reader, opts ...Option) *Response
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}
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// HTTPClient 实现 Client 接口
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type HTTPClient struct {
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mu sync.Mutex
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options *options
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}
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func NewClient(opts ...Option) Client {
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client := &HTTPClient{
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options: newDefaultOption(),
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}
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for _, o := range opts {
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o.apply(client.options)
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}
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return client
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}
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// Request 发送HTTP请求
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func (c HTTPClient) Request(method, target string, body io.Reader, opts ...Option) *Response {
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// 应用额外设置
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c.mu.Lock()
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options := *c.options
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c.mu.Unlock()
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for _, o := range opts {
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o.apply(&options)
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}
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// 创建请求客户端
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client := &http.Client{Timeout: options.timeout}
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// size为0时将body设为nil
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if options.contentLength == 0 {
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body = nil
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}
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// 确定请求URL
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if options.endpoint != nil {
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targetURL := *options.endpoint
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targetURL.Path = path.Join(targetURL.Path, target)
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target = targetURL.String()
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}
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// 创建请求
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var (
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req *http.Request
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err error
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)
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if options.ctx != nil {
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req, err = http.NewRequestWithContext(options.ctx, method, target, body)
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} else {
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req, err = http.NewRequest(method, target, body)
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}
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if err != nil {
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return &Response{Err: err}
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}
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// 添加请求相关设置
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if options.header != nil {
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for k, v := range options.header {
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req.Header.Add(k, strings.Join(v, " "))
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}
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}
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if options.masterMeta && conf.SystemConfig.Mode == "master" {
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req.Header.Add("X-Site-Url", model.GetSiteURL().String())
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req.Header.Add("X-Site-Id", model.GetSettingByName("siteID"))
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req.Header.Add("X-Cloudreve-Version", conf.BackendVersion)
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}
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if options.slaveNodeID != "" && conf.SystemConfig.Mode == "slave" {
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req.Header.Add("X-Node-Id", options.slaveNodeID)
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}
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if options.contentLength != -1 {
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req.ContentLength = options.contentLength
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}
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// 签名请求
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if options.sign != nil {
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switch method {
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case "PUT", "POST", "PATCH":
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auth.SignRequest(options.sign, req, options.signTTL)
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default:
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if resURL, err := auth.SignURI(options.sign, req.URL.String(), options.signTTL); err == nil {
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req.URL = resURL
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}
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}
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}
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// 发送请求
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resp, err := client.Do(req)
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if err != nil {
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return &Response{Err: err}
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}
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return &Response{Err: nil, Response: resp}
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}
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// GetResponse 检查响应并获取响应正文
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func (resp *Response) GetResponse() (string, error) {
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if resp.Err != nil {
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return "", resp.Err
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}
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respBody, err := ioutil.ReadAll(resp.Response.Body)
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_ = resp.Response.Body.Close()
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return string(respBody), err
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}
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// CheckHTTPResponse 检查请求响应HTTP状态码
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func (resp *Response) CheckHTTPResponse(status int) *Response {
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if resp.Err != nil {
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return resp
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}
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// 检查HTTP状态码
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if resp.Response.StatusCode != status {
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resp.Err = fmt.Errorf("服务器返回非正常HTTP状态%d", resp.Response.StatusCode)
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}
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return resp
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}
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// DecodeResponse 尝试解析为serializer.Response，并对状态码进行检查
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func (resp *Response) DecodeResponse() (*serializer.Response, error) {
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if resp.Err != nil {
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return nil, resp.Err
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}
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respString, err := resp.GetResponse()
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if err != nil {
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return nil, err
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}
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var res serializer.Response
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err = json.Unmarshal([]byte(respString), &res)
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if err != nil {
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util.Log().Debug("无法解析回调服务端响应：%s", string(respString))
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return nil, err
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}
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return &res, nil
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}
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// NopRSCloser 实现不完整seeker
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type NopRSCloser struct {
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body io.ReadCloser
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status *rscStatus
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}
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type rscStatus struct {
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// http.ServeContent 会读取一小块以决定内容类型，
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// 但是响应body无法实现seek，所以此项为真时第一个read会返回假数据
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IgnoreFirst bool
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Size int64
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}
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// GetRSCloser 返回带有空seeker的RSCloser，供http.ServeContent使用
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func (resp *Response) GetRSCloser() (*NopRSCloser, error) {
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if resp.Err != nil {
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return nil, resp.Err
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}
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return &NopRSCloser{
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body: resp.Response.Body,
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status: &rscStatus{
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Size: resp.Response.ContentLength,
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},
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}, resp.Err
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}
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// SetFirstFakeChunk 开启第一次read返回空数据
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// TODO 测试
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func (instance NopRSCloser) SetFirstFakeChunk() {
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instance.status.IgnoreFirst = true
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}
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// SetContentLength 设置数据流大小
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func (instance NopRSCloser) SetContentLength(size int64) {
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instance.status.Size = size
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}
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// Read 实现 NopRSCloser reader
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func (instance NopRSCloser) Read(p []byte) (n int, err error) {
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if instance.status.IgnoreFirst && len(p) == 512 {
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return 0, io.EOF
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}
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return instance.body.Read(p)
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}
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// Close 实现 NopRSCloser closer
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func (instance NopRSCloser) Close() error {
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return instance.body.Close()
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}
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// Seek 实现 NopRSCloser seeker, 只实现seek开头/结尾以便http.ServeContent用于确定正文大小
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func (instance NopRSCloser) Seek(offset int64, whence int) (int64, error) {
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// 进行第一次Seek操作后，取消忽略选项
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if instance.status.IgnoreFirst {
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instance.status.IgnoreFirst = false
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}
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if offset == 0 {
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switch whence {
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case io.SeekStart:
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return 0, nil
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case io.SeekEnd:
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return instance.status.Size, nil
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}
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}
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return 0, errors.New("未实现")
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}
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// BlackHole 将客户端发来的数据放入黑洞
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func BlackHole(r io.Reader) {
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if !model.IsTrueVal(model.GetSettingByName("reset_after_upload_failed")) {
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_, err := io.Copy(ioutil.Discard, r)
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if err != nil {
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util.Log().Debug("黑洞数据出错，%s", err)
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}
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}
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}
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