308 lines
8.2 KiB
Go
308 lines
8.2 KiB
Go
package main
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import (
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"bytes"
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"errors"
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"image"
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_ "image/gif"
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_ "image/jpeg"
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_ "image/png"
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"io"
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"net/http"
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"strings"
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valid "github.com/asaskevich/govalidator"
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"github.com/gin-gonic/gin"
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"github.com/rs/zerolog/log"
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exifremove "github.com/scottleedavis/go-exif-remove"
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"github.com/twharmon/gouid"
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"golang.org/x/crypto/blake2b"
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"git.tcp.direct/tcp.direct/tcp.ac/config"
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)
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var fExt string
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func imgDel(c *gin.Context) {
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slog := log.With().Str("caller", "imgView").Logger()
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rKey := c.Param("key")
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if !validateKey(rKey) {
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errThrow(c, 400, errors.New("failed to validate delete key"), "invalid request")
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return
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}
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targetImg, err := db.With("key").Get([]byte(rKey))
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if err != nil {
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errThrow(c, 400, err, "invalid request")
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return
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}
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if targetImg == nil || !strings.Contains(string(targetImg), "i.") {
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errThrow(c, 400, errors.New("no img delete entry found with provided key"), "invalid request")
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return
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}
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finalTarget := strings.Split(string(targetImg), ".")
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if !db.With("img").Has([]byte(finalTarget[1])) {
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// this shouldn't happen...?
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errThrow(c, 500, errors.New("corresponding image todelete not found in database"), "internal server error")
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return
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}
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err = db.With("img").Delete([]byte(finalTarget[1]))
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if err != nil {
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errThrow(c, 500, err, "internal server error")
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return
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}
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if db.With("img").Has([]byte(finalTarget[1])) {
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slog.Error().Str("rkey", finalTarget[1]).Msg("delete failed!?")
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errThrow(c, 500, errors.New("failed to delete entry"), "internal server error")
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return
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}
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slog.Info().Str("rkey", finalTarget[1]).Msg("Image file deleted successfully")
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slog.Trace().Str("rkey", finalTarget[1]).Msg("Removing delete key entry")
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err = db.With("key").Delete([]byte(rKey))
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if err != nil {
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slog.Error().Str("rkey", finalTarget[1]).Msg("Couldn't delete key")
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// it would be insane to try and delete the hash here
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} // if someone is uploading this image again after del
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c.JSON(200, "DELETE_SUCCESS") // and the file corresponding to the hash no longer exists
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// we will delete the hash entry then and re-add then
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}
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func imgView(c *gin.Context) {
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slog := log.With().Str("caller", "imgView").Logger()
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sUID := strings.Split(c.Param("uid"), ".")
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rUID := sUID[0]
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if len(sUID) > 1 {
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fExt = strings.ToLower(sUID[1])
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slog.Trace().Str("ext", fExt).Msg("detected file extension")
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if fExt != "png" && fExt != "jpg" && fExt != "jpeg" && fExt != "gif" {
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errThrow(c, 400, errors.New("bad file extension"), "invalid request")
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return
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}
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} else {
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fExt = "nil"
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}
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// if it doesn't match the key size or it isn't alphanumeric - throw it out
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if !valid.IsAlphanumeric(rUID) || len(rUID) != config.UIDSize {
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slog.Warn().
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Str("remoteaddr", c.ClientIP()).
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Msg("request discarded as invalid")
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errThrow(c, 400, errors.New("invalid request"), "invalid request")
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return
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}
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// now that we think its a valid request we will query
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slog.Trace().Str("rUid", rUID).Msg("request validated")
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// query bitcask for the id
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fBytes, _ := db.With("img").Get([]byte(rUID))
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if fBytes == nil {
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slog.Error().Str("rUid", rUID).Msg("no corresponding file for this id")
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errThrow(c, 404, errors.New("entry not found"), "File not found")
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return
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}
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// read the data from bitcask into a reader
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file := bytes.NewReader(fBytes)
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imageFormat, err := checkImage(file)
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if err != nil {
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// extra sanity check to make sure we don't serve non-image data that somehow got into the database
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errThrow(c, http.StatusBadRequest, errors.New("entry in datbase is not an image: "+err.Error()), "invalid request")
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return
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}
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// additional extension sanity check - if they're gonna use an extension it needs to be the right one
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if fExt != "nil" && fExt != imageFormat {
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errThrow(c, 400, errors.New("requested file extension does not match filetype"), "invalid request")
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return
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}
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// extension or not (they are optional)
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// we give them the proper content type
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contentType := "image/" + imageFormat
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c.Data(200, contentType, fBytes)
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slog.Info().Str("rUid", rUID).Msg("Successful upload")
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}
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func newUIDandKey() (uid string, key string) {
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slog := log.With().Str("caller", "newUIDandKey").Logger()
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// generate new uid and delete key
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uid = gouid.String(config.UIDSize, gouid.MixedCaseAlphaNum)
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key = gouid.String(config.DeleteKeySize, gouid.MixedCaseAlphaNum)
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// lets make sure that we don't clash even though its highly unlikely
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for db.With("img").Has([]byte(uid)) {
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slog.Warn().Msg(" uid already exists! generating new...")
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uid = gouid.String(config.UIDSize, gouid.MixedCaseAlphaNum)
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}
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for db.With("key").Has([]byte(key)) {
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slog.Warn().Msg(" delete key already exists! generating new...")
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key = gouid.String(config.DeleteKeySize, gouid.MixedCaseAlphaNum)
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}
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return
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}
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func readAndScrubImage(file io.ReadSeeker) (scrubbed []byte, err error) {
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imageFormat, err := checkImage(file)
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if err != nil {
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return
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}
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// dump this into a byte object and scrub it
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// TO-DO: Write our own function for scrubbing exif
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fbytes, err := io.ReadAll(file)
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if err != nil {
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return
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}
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scrubbed = fbytes
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if imageFormat == "gif" {
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return
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}
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scrubbed, err = exifremove.Remove(fbytes)
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if err != nil {
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return
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}
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return
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}
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func imgPost(c *gin.Context) {
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slog := log.With().Str("caller", "imgPost").
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Str("User-Agent", c.GetHeader("User-Agent")).
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Str("RemoteAddr", c.ClientIP()).Logger()
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var priv = false
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// check if incoming POST data is invalid
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f, err := c.FormFile("upload")
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if err != nil || f == nil {
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errThrow(c, http.StatusBadRequest, err, "invalid request")
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}
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slog.Debug().Str("filename", f.Filename).Msg("[+] New upload")
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// read the incoming file into an io file reader
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file, err := f.Open()
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if err != nil {
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errThrow(c, http.StatusInternalServerError, err, "error processing file\n")
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return
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}
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scrubbed, err := readAndScrubImage(file)
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if err != nil {
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errThrow(c, http.StatusBadRequest, err, "invalid request")
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return
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}
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Hashr, err := blake2b.New(64, nil)
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if err != nil {
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errThrow(c, http.StatusInternalServerError, err, "internal server error")
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}
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Hashr.Write(scrubbed)
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hash := Hashr.Sum(nil)
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// the keys (stored in memory) for db.With("hsh") are hashes
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// making it quick to find duplicates. the value is the uid
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if db.With("hsh").Has(hash) {
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imgRef, err := db.With("hsh").Get(hash)
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if err != nil {
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errThrow(c, http.StatusInternalServerError, err, "internal server error")
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return
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}
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slog.Trace().Caller().Msg("duplicate checksum in hash database, checking if file still exists...")
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if db.With("img").Has(imgRef) {
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slog.Debug().Str("ogUid", string(imgRef)).Msg("duplicate file found! returning original URL")
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post := &Post{entryType: Image, uid: string(imgRef), key: "", priv: false}
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post.Serve(c)
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return
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}
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slog.Trace().
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Str("ogUid", string(imgRef)).
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Msg("stale hash found, deleting entry...")
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err = db.With("hsh").Delete(hash)
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if err != nil {
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slog.Warn().Err(err).Msg("failed to delete stale hash")
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}
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}
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uid, key := newUIDandKey()
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// save checksum to db to prevent dupes in the future
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err = db.With("hsh").Put(hash, []byte(uid))
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if err != nil {
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errThrow(c, 500, err, "upload failed")
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return
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}
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// insert actual file to database
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slog.Trace().Str("uid", uid).Msg("saving file to database")
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err = db.With("img").Put([]byte(uid), scrubbed)
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if err != nil {
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errThrow(c, 500, err, "upload failed")
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return
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}
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// add delete key to database with image prefix
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// there is a whole db for delete keys
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err = db.With("key").Put([]byte(key), []byte("i."+uid))
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if err != nil {
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errThrow(c, http.StatusInternalServerError, err, "internal error")
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return
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}
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// good to go, send them to the finisher function
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slog.Trace().Str("uid", uid).Msg("saved to database successfully, sending to Serve")
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post := &Post{
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entryType: Image,
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uid: uid,
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key: key,
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priv: priv,
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}
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post.Serve(c)
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}
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func checkImage(r io.ReadSeeker) (fmt string, err error) {
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// in theory this makes sure the file is an image via magic bytes
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_, fmt, err = image.Decode(r)
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if err != nil {
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return
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}
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_, err = r.Seek(0, 0)
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return
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}
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func getSize(s io.Seeker) (size int64, err error) {
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// get size of file
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if _, err = s.Seek(0, 0); err != nil {
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return
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}
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// 2 == from the end of the file
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if size, err = s.Seek(0, 2); err != nil {
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return
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}
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_, err = s.Seek(0, 0)
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return
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}
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