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Retrieve metadata for an image using exiftool
The exiftool can return json using the -json flag, so extract the EXIF and ITPC data from an image file using it.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package internal | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "log" | ||
| "os/exec" | ||
| ) | ||
|
|
||
| type ImageInfo struct { | ||
| Width uint `json:"ExifImageWidth"` | ||
| Height uint `json:"ExifImageHeight"` | ||
| Title string `json:"ObjectName"` | ||
| Description string `json:"Caption-Abstract"` | ||
| Keywords stringArray `json:"Keywords"` | ||
| DateCreated string `json:"DateTimeOriginal"` | ||
| Make string `json:"Make"` | ||
| Model string `json:"Model"` | ||
| ShutterSpeed string `json:"ShutterSpeedValue"` | ||
| Aperture json.Number `json:"ApertureValue"` | ||
| ISO json.Number `json:"ISO"` | ||
| } | ||
|
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| // A stringArray is an array of strings that has been unmarshalled from a JSON | ||
| // property that could be either a string or an array of string | ||
| type stringArray []string | ||
|
|
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| func (sa *stringArray) UnmarshalJSON(data []byte) error { | ||
| if len(data) > 0 { | ||
| switch data[0] { | ||
| case '"': | ||
| var s string | ||
| if err := json.Unmarshal(data, &s); err != nil { | ||
| return err | ||
| } | ||
| *sa = stringArray([]string{s}) | ||
| case '[': | ||
| var s []string | ||
| if err := json.Unmarshal(data, &s); err != nil { | ||
| return err | ||
| } | ||
| *sa = stringArray(s) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Read metadata (Exif/IPTC) from image using exiftool | ||
| func GetImageInfo(filename string, exiftool string) (*ImageInfo, error) { | ||
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| cmd := exec.Command(exiftool, "-j", "-exif:*", "-iptc:*", filename) | ||
|
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| out, err := cmd.Output() | ||
| if err != nil { | ||
| fmt.Println("Error: ", err) | ||
| return nil, err | ||
| } | ||
|
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| // Exiftool always returns an array but as we only passed in one filename we know that there's only one element. | ||
| // Remove the surrounding `[` and `]` from the JSON string to convert to a single object. | ||
| out = out[1 : len(out)-2] | ||
|
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| info := ImageInfo{} | ||
| err = json.Unmarshal(out, &info) | ||
| if err != nil { | ||
| log.Println(err) | ||
| } | ||
|
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| return &info, nil | ||
| } |