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package handles
import (
"fmt"
"io"
stdpath "path"
"strings"
"github.com/alist-org/alist/v3/internal/conf"
"github.com/alist-org/alist/v3/internal/driver"
"github.com/alist-org/alist/v3/internal/fs"
"github.com/alist-org/alist/v3/internal/model"
"github.com/alist-org/alist/v3/internal/setting"
"github.com/alist-org/alist/v3/internal/sign"
"github.com/alist-org/alist/v3/pkg/utils"
"github.com/alist-org/alist/v3/server/common"
"github.com/gin-gonic/gin"
log "github.com/sirupsen/logrus"
)
func Down(c *gin.Context) {
rawPath := c.MustGet("path").(string)
filename := stdpath.Base(rawPath)
storage, err := fs.GetStorage(rawPath, &fs.GetStoragesArgs{})
if err != nil {
common.ErrorResp(c, err, 500)
return
}
if common.ShouldProxy(storage, filename) {
Proxy(c)
return
} else {
link, _, err := fs.Link(c, rawPath, model.LinkArgs{
IP: c.ClientIP(),
Header: c.Request.Header,
Type: c.Query("type"),
HttpReq: c.Request,
})
if err != nil {
common.ErrorResp(c, err, 500)
return
}
if link.MFile != nil {
defer func(ReadSeekCloser io.ReadCloser) {
err := ReadSeekCloser.Close()
if err != nil {
log.Errorf("close data error: %s", err)
}
}(link.MFile)
}
c.Header("Referrer-Policy", "no-referrer")
c.Header("Cache-Control", "max-age=0, no-cache, no-store, must-revalidate")
if setting.GetBool(conf.ForwardDirectLinkParams) {
query := c.Request.URL.Query()
for _, v := range conf.SlicesMap[conf.IgnoreDirectLinkParams] {
query.Del(v)
}
link.URL, err = utils.InjectQuery(link.URL, query)
if err != nil {
common.ErrorResp(c, err, 500)
return
}
}
c.Redirect(302, link.URL)
}
}
func Proxy(c *gin.Context) {
rawPath := c.MustGet("path").(string)
filename := stdpath.Base(rawPath)
storage, err := fs.GetStorage(rawPath, &fs.GetStoragesArgs{})
if err != nil {
common.ErrorResp(c, err, 500)
return
}
if canProxy(storage, filename) {
downProxyUrl := storage.GetStorage().DownProxyUrl
if downProxyUrl != "" {
_, ok := c.GetQuery("d")
if !ok {
URL := fmt.Sprintf("%s%s?sign=%s",
strings.Split(downProxyUrl, "\n")[0],
utils.EncodePath(rawPath, true),
sign.Sign(rawPath))
c.Redirect(302, URL)
return
}
}
link, file, err := fs.Link(c, rawPath, model.LinkArgs{
Header: c.Request.Header,
Type: c.Query("type"),
HttpReq: c.Request,
})
if err != nil {
common.ErrorResp(c, err, 500)
return
}
if link.URL != "" && setting.GetBool(conf.ForwardDirectLinkParams) {
query := c.Request.URL.Query()
for _, v := range conf.SlicesMap[conf.IgnoreDirectLinkParams] {
query.Del(v)
}
link.URL, err = utils.InjectQuery(link.URL, query)
if err != nil {
common.ErrorResp(c, err, 500)
return
}
}
err = common.Proxy(c.Writer, c.Request, link, file)
if err != nil {
common.ErrorResp(c, err, 500, true)
return
}
} else {
common.ErrorStrResp(c, "proxy not allowed", 403)
return
}
}
// TODO need optimize
// when can be proxy?
// 1. text file
// 2. config.MustProxy()
// 3. storage.WebProxy
// 4. proxy_types
// solution: text_file + shouldProxy()
func canProxy(storage driver.Driver, filename string) bool {
if storage.Config().MustProxy() || storage.GetStorage().WebProxy || storage.GetStorage().WebdavProxy() {
return true
}
if utils.SliceContains(conf.SlicesMap[conf.ProxyTypes], utils.Ext(filename)) {
return true
}
if utils.SliceContains(conf.SlicesMap[conf.TextTypes], utils.Ext(filename)) {
return true
}
return false
}
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