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-rw-r--r--bridge/helper/helper.go51
1 files changed, 50 insertions, 1 deletions
diff --git a/bridge/helper/helper.go b/bridge/helper/helper.go
index 41244766..2b449e14 100644
--- a/bridge/helper/helper.go
+++ b/bridge/helper/helper.go
@@ -5,7 +5,10 @@ import (
"fmt"
"image/png"
"io"
+ "io/ioutil"
"net/http"
+ "os"
+ "os/exec"
"regexp"
"strings"
"time"
@@ -192,7 +195,7 @@ func ParseMarkdown(input string) string {
return res
}
-// ConvertWebPToPNG convert input data (which should be WebP format to PNG format)
+// ConvertWebPToPNG converts input data (which should be WebP format) to PNG format
func ConvertWebPToPNG(data *[]byte) error {
r := bytes.NewReader(*data)
m, err := webp.Decode(r)
@@ -207,3 +210,49 @@ func ConvertWebPToPNG(data *[]byte) error {
*data = w.Bytes()
return nil
}
+
+// CanConvertTgsToX Checks whether the external command necessary for ConvertTgsToX works.
+func CanConvertTgsToX() error {
+ // We depend on the fact that `lottie_convert.py --help` has exit status 0.
+ // Hyrum's Law predicted this, and Murphy's Law predicts that this will break eventually.
+ // However, there is no alternative like `lottie_convert.py --is-properly-installed`
+ cmd := exec.Command("lottie_convert.py", "--help")
+ return cmd.Run()
+}
+
+// ConvertTgsToWebP convert input data (which should be tgs format) to WebP format
+// This relies on an external command, which is ugly, but works.
+func ConvertTgsToX(data *[]byte, outputFormat string, logger *logrus.Entry) error {
+ // lottie can't handle input from a pipe, so write to a temporary file:
+ tmpFile, err := ioutil.TempFile(os.TempDir(), "matterbridge-lottie-*.tgs")
+ if err != nil {
+ return err
+ }
+ tmpFileName := tmpFile.Name()
+ defer func() {
+ if removeErr := os.Remove(tmpFileName); removeErr != nil {
+ logger.Errorf("Could not delete temporary file %s: %v", tmpFileName, removeErr)
+ }
+ }()
+
+ if _, writeErr := tmpFile.Write(*data); writeErr != nil {
+ return writeErr
+ }
+ // Must close before calling lottie to avoid data races:
+ if closeErr := tmpFile.Close(); closeErr != nil {
+ return closeErr
+ }
+
+ // Call lottie to transform:
+ cmd := exec.Command("lottie_convert.py", "--input-format", "lottie", "--output-format", outputFormat, tmpFileName, "/dev/stdout")
+ cmd.Stderr = nil
+ // NB: lottie writes progress into to stderr in all cases.
+ stdout, stderr := cmd.Output()
+ if stderr != nil {
+ // 'stderr' already contains some parts of Stderr, because it was set to 'nil'.
+ return stderr
+ }
+
+ *data = stdout
+ return nil
+}