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import * as dates from 'date-fns';
import * as exifParser from 'exif-parser';
import piexif from 'piexifjs';
import { Schemas } from './database.js';
import { EXIF_GPS_FIELDS } from './exiffields.js';
import * as db from './idb.svelte.js';
import { storeMetadataValue } from './metadata.js';
import { ensureNamespacedMetadataId } from './schemas/metadata.js';
import { toasts } from './toasts.svelte.js';
/**
* @import { MetadataInferOptions, MetadataType } from './database.js';
* @import { RuntimeValue } from './metadata.js';
*/
/**
*
* @param {string} sessionId
* @param {string} imageFileId
* @param {ArrayBuffer|Buffer} imageBytes
* @param {{ type: string; name: string }} file
*/
export async function processExifData(sessionId, imageFileId, imageBytes, file) {
const session = await db.tables.Session.get(sessionId);
Iif (!session) {
throw new Error(`Session ${sessionId} introuvable`);
}
const protocol = await db.tables.Protocol.get(session.protocol);
Iif (!protocol) {
throw new Error(`Protocole ${session.protocol} introuvable`);
}
const metadataOfProtocol = await db.tables.Metadata.list().then((defs) =>
defs.filter((def) => protocol.metadata.includes(def.id))
);
const metadataFromExif = await extractMetadata(
// 2^16 + 100 of margin
// see https://www.npmjs.com/package/exif-parser#creating-a-parser
imageBytes.slice(0, 65_635),
(metadataOfProtocol ?? [])
.map(({ infer, type, id }) =>
match
.case(
[
{ exif: 'string' },
'|',
{ latitude: { exif: 'string' }, longitude: { exif: 'string' } }
],
(infer) => /** @type {ExifExtractionPlanItem} */ ({ key: id, infer, type })
)
.default(() => undefined)(infer)
)
.filter((entry) => entry !== undefined)
).catch((e) => {
console.warn(e);
if (file.type === 'image/jpeg') {
toasts.warn(
`Impossible d'extraire les métadonnées EXIF de ${file.name}: ${e?.toString() ?? 'Erreur inattendue'}`
);
}
return {};
});
const images = await db
.list('Image')
.then((imgs) => imgs.filter((img) => img.fileId === imageFileId));
for (const { id: subjectId } of images) {
for (const [key, { value, confidence }] of Object.entries(metadataFromExif)) {
await storeMetadataValue({
db: db.databaseHandle(),
subjectId,
sessionId: session.id,
metadataId: ensureNamespacedMetadataId(key, protocol.id),
value,
confidence
});
}
}
}
/**
* @typedef {object} ExifExtractionPlanItem
* @property {string} key key in the output object
* @property {MetadataInferOptions | { latitude: MetadataInferOptions, longitude: MetadataInferOptions }} infer how to extract the value
* @property {MetadataType} type type to coerce the extracted value to
*/
/**
* @param {ArrayBuffer | Buffer} buffer buffer of the image to extract EXIF data from
* @param {ExifExtractionPlanItem[]} extractionPlan
* @returns {Promise<Record<string, { value: unknown; confidence: number; alternatives: Record<string, unknown> }>>}
*/
export async function extractMetadata(buffer, extractionPlan) {
const exif = exifParser.create(buffer).enableImageSize(false).parse();
Iif (!exif) return {};
console.debug('Starting EXIF Extraction', { extractionPlan, exif });
const extract = match
.case(
{
type: '"location"',
infer: {
latitude: { exif: 'string' },
longitude: { exif: 'string' }
}
},
({ infer }) => ({
confidence: 1,
alternatives: {},
value: {
longitude: coerceExifValue(exif.tags[infer.longitude.exif], 'float'),
latitude: coerceExifValue(exif.tags[infer.latitude.exif], 'float')
}
})
)
.case(
{
type: Schemas.MetadataTypeSchema,
infer: { exif: 'string' }
},
({ infer, type }) => ({
confidence: 1,
alternatives: {},
value: coerceExifValue(exif.tags[infer.exif], type)
})
)
.default(() => undefined);
return Object.fromEntries(
extractionPlan
.map(({ key: id, ...option }) => {
return /** @type {const} */ ([id, extract(option)]);
})
.filter(
([, extracted]) =>
extracted !== undefined &&
!type({ latitude: 'number.NaN', longitude: 'number.NaN' }).allows(
extracted.value
) &&
!Number.isNaN(extracted.value)
)
);
}
/**
*
* @template {import('./database.js').MetadataType} T
* @param {unknown} value
* @param {T} coerceTo
* @returns {import('./metadata.js').RuntimeValue<T>}
*/
export function coerceExifValue(value, coerceTo) {
switch (coerceTo) {
case 'string':
return value?.toString() ?? '';
case 'boolean':
return Boolean(value);
case 'date':
if (typeof value !== 'number') throw new Error('Date value must be a number');
if (Number.isNaN(value)) throw new Error('Date value is invalid');
return new Date(value * 1e3);
case 'boundingbox':
throw new Error('Bounding box not supported in EXIF');
case 'enum':
if (typeof value !== 'string') throw new Error('Enum value must be a string');
return value;
case 'integer':
case 'float':
return Number(value);
default:
throw new Error(`Unknown type ${coerceTo}`);
}
}
/**
* Serialize a value to a string for EXIF writing
* @param {unknown} value
* @returns {string|any[]}
*/
export function serializeExifValue(value) {
if (value instanceof Date) return dates.format(value, 'yyyy:MM:dd HH:mm:ss');
// Let multivalued exif entries through
if (Array.isArray(value)) return value;
if (value === undefined) return 'undefined';
if (value === null) return 'null';
if (typeof value === 'object' && value !== null) {
return Object.entries(value)
.map(([key, val]) => `${key}=${val}`)
.join(';');
}
return value?.toString() ?? '';
}
/**
* Append EXIF metadata to the image's bytes
* @param {ArrayBuffer|Buffer} bytes
* @param {import('./database.js').Metadata[]} metadataDefs
* @param {import('./database.js').MetadataValues} metadataValues
* @returns {Uint8Array} the image with EXIF metadata added
*/
export function addExifMetadata(bytes, metadataDefs, metadataValues) {
const ExifMetadata = Schemas.Metadata.and({
infer: [
{ exif: 'string' },
'|',
{ latitude: { exif: 'string' }, longitude: { exif: 'string' } }
]
});
const exifDict = { GPS: {}, Exif: {} };
const setExifKey = (key, value) => {
// @wc-ignore
const category = Object.keys(EXIF_GPS_FIELDS).includes(key) ? 'GPS' : 'Exif';
const serialized = serializeExifValue(value);
Iif (serialized === undefined) return;
exifDict[category][piexif[`${category}IFD`][key]] = serialized;
};
for (const def of metadataDefs.map((m) => ExifMetadata(m))) {
if (def instanceof type.errors) continue;
const value = metadataValues[def.id]?.value;
Iif (value === undefined) continue;
if (
type({ latitude: { exif: 'string' }, longitude: { exif: 'string' } }).allows(
def.infer
) &&
type({ latitude: 'number', longitude: 'number' }).allows(value)
) {
// XXX harcoded BS :/
if (def.infer.latitude.exif === 'GPSLatitude') {
setExifKey('GPSLatitudeRef', value.latitude >= 0 ? 'N' : 'S');
setExifKey('GPSLatitude', piexif.GPSHelper.degToDmsRational(value.latitude));
} else E{
setExifKey(def.infer.latitude.exif, value.latitude);
}
// XXX harcoded BS :/
if (def.infer.longitude.exif === 'GPSLongitude') {
setExifKey('GPSLongitudeRef', value.longitude >= 0 ? 'E' : 'W');
setExifKey('GPSLongitude', piexif.GPSHelper.degToDmsRational(value.longitude));
} else E{
setExifKey(def.infer.longitude.exif, value.longitude);
}
} else {
setExifKey(def.infer.exif, value);
}
}
// Piexif wants bytes _as a string_. why??? idk. but it seems like npm has no decent EXIF libraries that both support browsers and writing exif data.
let bytesstr = '';
// Build bytesstr in chunks, since String.fromCharCode is limited in characters size (see https://stackoverflow.com/q/76857530 and https://stackoverflow.com/a/22747272)
let chunksize = 32_000;
for (let i = 0; i < bytes.byteLength; i += chunksize) {
const chunk = bytes.slice(i, i + chunksize);
bytesstr += String.fromCharCode(...new Uint8Array(chunk));
}
const outputstr = piexif.insert(piexif.dump(exifDict), bytesstr);
return new Uint8Array(Array.from(outputstr).map((c) => c.charCodeAt(0)));
}
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