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package request
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/HFO4/cloudreve/pkg/auth"
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"github.com/HFO4/cloudreve/pkg/serializer"
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"github.com/HFO4/cloudreve/pkg/util"
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"io"
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"io/ioutil"
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"net/http"
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"time"
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)
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// GeneralClient 通用 HTTP Client
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var GeneralClient Client = HTTPClient{}
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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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}
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// Option 发送请求的额外设置
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type Option interface {
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apply(*options)
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}
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type options struct {
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timeout time.Duration
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header http.Header
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sign auth.Auth
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signTTL int64
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ctx context.Context
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contentLength int64
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}
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type optionFunc func(*options)
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func (f optionFunc) apply(o *options) {
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f(o)
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}
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func newDefaultOption() *options {
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return &options{
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header: http.Header{},
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timeout: time.Duration(30) * time.Second,
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contentLength: -1,
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}
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}
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// WithTimeout 设置请求超时
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func WithTimeout(t time.Duration) Option {
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return optionFunc(func(o *options) {
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o.timeout = t
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})
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}
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// WithContext 设置请求上下文
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func WithContext(c context.Context) Option {
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return optionFunc(func(o *options) {
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o.ctx = c
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})
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}
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// WithCredential 对请求进行签名
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func WithCredential(instance auth.Auth, ttl int64) Option {
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return optionFunc(func(o *options) {
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o.sign = instance
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o.signTTL = ttl
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})
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}
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// WithHeader 设置请求Header
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func WithHeader(header http.Header) Option {
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return optionFunc(func(o *options) {
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o.header = header
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})
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}
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// WithContentLength 设置请求大小
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func WithContentLength(s int64) Option {
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return optionFunc(func(o *options) {
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o.contentLength = s
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})
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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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options := newDefaultOption()
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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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// 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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req.Header = options.header
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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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auth.SignRequest(options.sign, req, options.signTTL)
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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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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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size int64
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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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}
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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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size: resp.Response.ContentLength,
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status: &rscStatus{},
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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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// 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 {
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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.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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