Created
July 24, 2022 03:06
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Functions for reading or writing png exif metadata
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| const { ExifTool, Tags } = require('exiftool-vendored'); | |
| /** | |
| * Function to write makernote and exif data to a PNG file. | |
| * @param {string} filePath - Path to the PNG file. | |
| * @param {string} makerNote - Makernote exif key data to write. | |
| * @param {string} comment - Comment exif key data to write. | |
| * @return {Promise<boolean>} - True if successful, false otherwise. | |
| */ | |
| export const writeMetadata = async (filePath, makerNote, comment) => { | |
| const tool = new ExifTool(); | |
| let success = false; | |
| try { | |
| // Open the file with ExifTool and write the metadata. | |
| await tool.write(filePath, { | |
| MakerNoteUnknownText: makerNote, | |
| UserComment: comment, | |
| }); | |
| success = true; | |
| } catch (err) { | |
| console.error(err); | |
| success = false; | |
| } finally { | |
| await tool.end(true); | |
| return success; | |
| } | |
| }; | |
| /** | |
| * Function to read makernote and exif data from a PNG file. | |
| * @param {string} filePath - Path to the PNG file. | |
| * @returns {Promise<Tags> | null} key value object containing exif data or null if error occurs. | |
| */ | |
| export const readMetadata = async (filePath) => { | |
| const tool = new ExifTool(); | |
| try { | |
| // Read the metadata from the file. | |
| const metadata = await tool.read(filePath); | |
| // Gracefully end the exiftool process. | |
| await tool.end(true); | |
| return metadata; | |
| } catch (err) { | |
| console.error(`Failed to read exif data: ${err}`); | |
| // Gracefully end the exiftool process. | |
| await tool.end(true); | |
| return null; | |
| } | |
| }; |
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