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import type { ExifFieldKey } from './exiffields.js';
import type { NamespacedMetadataID } from './schemas/common.js';
import type { RuntimeValue } from './schemas/metadata.js';
import { type } from 'arktype';
import * as dates from 'date-fns';
import * as exifParser from 'exif-parser';
import piexif from 'piexifjs';
import { Schemas } from './database.js';
import { SANE_ISO_DATE_FORMATS, tryParseDate } from './date.js';
import { EXIF_FIELDS, exifParserKeyToRealKey } from './exiffields.js';
import {
geolocationAccuracyFromMake,
geolocationAccuracyToConfidence,
gpsDilutionOfPrecisionToConfidence,
} from './geolocation.js';
import { errorMessage } from './i18n.js';
import * as db from './idb.svelte.js';
import { resolveMetadataImport, storeMetadataValue } from './metadata/index.js';
import { toasts } from './toasts.svelte.js';
import { byteString, byteStringToArray, throwError, transformObject } from './utils.js';
export async function processExifData({
sessionId,
imageFileId,
imageBytes,
file,
extra,
}: {
sessionId: string;
imageFileId: string;
imageBytes: ArrayBuffer | Buffer;
file: { type: string; name: string };
extra?: { [K in ExifFieldKey]?: unknown };
}) {
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 ${session.protocol} introuvable`);
}
const metadataOfProtocol = await db.tables.Metadata.getMany(
protocol.metadata.map((key) => resolveMetadataImport(protocol, key))
);
const metadataFromExif = {} as Record<NamespacedMetadataID, DB.MetadataValue>;
try {
const fields = {
...extra,
...(await parseExif(imageBytes, file.type)),
};
console.debug('Processing EXIF fields', fields);
for (const def of metadataOfProtocol ?? []) {
if (!def.infer) continue;
let coerced: RuntimeValue | undefined;
let confidence = 1;
if (def.type === 'location') {
Iif (!def.infer.longitude?.exif) continue;
Iif (!def.infer.latitude?.exif) continue;
const lngref = `${def.infer.longitude.exif}Ref` as const;
const latref = `${def.infer.latitude.exif}Ref` as const;
coerced = coerceExifValue('location', {
longitude: fields[def.infer.longitude.exif],
longitudeRef: lngref in fields ? fields[lngref as ExifFieldKey] : undefined,
latitude: fields[def.infer.latitude.exif],
latitudeRef: latref in fields ? fields[latref as ExifFieldKey] : undefined,
});
// TODO: could also work with other GPS-related keys, such as GPSDest*
Eif (
def.infer.longitude.exif === 'GPSLongitude' &&
def.infer.latitude.exif === 'GPSLatitude'
) {
const dop = coerceExifValue('float', fields.GPSDOP);
const herr =
coerceExifValue('float', fields.GPSHPositioningError) ??
geolocationAccuracyFromMake(coerceExifValue('string', fields.Make));
confidence = Math.min(
herr !== undefined ? geolocationAccuracyToConfidence(herr) : 1,
dop !== undefined ? gpsDilutionOfPrecisionToConfidence(dop) : 1
);
}
if (!coerced) {
console.warn(
`Couldn't coerce EXIF fields to ${def.type}:`,
def.infer.longitude.exif,
'=',
fields[def.infer.longitude.exif],
def.infer.latitude.exif,
'=',
fields[def.infer.latitude.exif]
);
}
} else {
Iif (!('exif' in def.infer)) continue;
Iif (!def.infer.exif) continue;
coerced = coerceExifValue(def.type, fields[def.infer.exif], def.infer.exif);
Iif (!coerced) {
console.warn(
`Couldn't coerce EXIF field(s) to ${def.type}:`,
def.infer.exif,
'=',
fields[def.infer.exif]
);
}
}
if (!coerced) continue;
metadataFromExif[def.id] = {
confidence,
alternatives: [],
value: coerced,
confirmed: false,
manuallyModified: false,
isDefault: false,
confidences: {},
};
}
} 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
.listByIndex('Image', 'sessionId', sessionId)
.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: key,
value,
confidence,
});
}
}
}
async function parseExif(buffer: ArrayBuffer | Buffer, contentType: string) {
Iif (contentType !== 'image/jpeg') return;
const exif = exifParser
.create(
// 2^16 + 100 of margin
// see https://www.npmjs.com/package/exif-parser#creating-a-parser
buffer.slice(0, 2 ** 16 + 100)
)
.enableImageSize(false)
.parse();
console.debug('Finished parsing EXIF data from bytes', exif);
return transformObject(exif.tags, (key, value) => {
try {
return [exifParserKeyToRealKey(key), value];
} catch (e) {
console.warn(
`Couldn't translate exif-parser field ${key} to a standard EXIF field:`,
e
);
return undefined;
}
});
}
export function coerceExifValue<T extends DB.MetadataType>(
coerceTo: T,
value: unknown,
field?: ExifFieldKey
): import('./schemas/metadata.js').RuntimeValue<T> | undefined {
if (value === undefined) return undefined;
Iif (value === null) return undefined;
switch (coerceTo) {
case 'string':
return value?.toString() ?? '';
case 'boolean':
return Boolean(value);
case 'date':
Iif (value instanceof Date) return value;
if (typeof value === 'string') {
return (
tryParseDate(
value,
...SANE_ISO_DATE_FORMATS,
// EXIF also has some weird date format standards
'yyyy:MM:dd HH:mm:SS',
'yyyy:MM:dd'
) ?? throwError('Date format is invalid')
);
}
Iif (typeof value !== 'number') {
throw new Error(
`Unexpected type ${typeof value} for a date, cannot coerce exif value`
);
}
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': {
Iif (type(['number', 'number']).array().allows(value)) {
const [[num, denom]] = value;
const coerced = num / denom;
if (field === 'Temperature') {
return avoidSentinelTemperature(coerced);
}
}
const coerced = Number(value);
if (field === 'Temperature') {
return avoidSentinelTemperature(coerced);
}
return coerced;
}
case 'location': {
Iif (!value) return;
Iif (typeof value !== 'object') return;
Iif (!('longitude' in value)) return;
Iif (!('latitude' in value)) return;
function coerceCoordinate(coord: unknown, ref: unknown, refFallback: string) {
Iif (type(['number', 'number']).array().allows(coord)) {
return piexif.GPSHelper.dmsRationalToDeg(
coord,
typeof ref === 'string' ? ref : refFallback
);
}
return coerceExifValue('float', coord, field);
}
const lng = coerceCoordinate(value.longitude, value.longitudeRef, 'E');
const lat = coerceCoordinate(value.latitude, value.latitudeRef, 'N');
if (!lng || !lat) return;
return { longitude: lng, latitude: lat };
}
default:
throw new Error(`Unknown type ${coerceTo}`);
}
}
/**
* Serialize a value to a string for EXIF writing
*/
export function serializeExifValue(value: unknown): string | unknown[] {
if (value instanceof Date) return dates.format(value, 'yyyy:MM:dd HH:mm:ss');
// Let multivalued exif entries through
if (Array.isArray(value)) return value;
if (typeof value === 'number') return [value];
if (value === undefined) return 'undefined';
if (value === null) return 'null';
if (typeof value === 'object' && value !== null) {
return Object.entries(value)
.map(([key, val]) => `${key}=${val}`)
.join(';');
}
return value?.toString() ?? '';
}
export function addExifMetadata(
bytes: ArrayBuffer | Buffer,
metadataDefs: DB.Metadata[],
metadataValues: DB.MetadataValues
): Uint8Array {
const ExifMetadata = Schemas.Metadata.and({
infer: [
{ exif: 'string' },
'|',
{ latitude: { exif: 'string' }, longitude: { exif: 'string' } },
],
});
const changes: Partial<Record<ExifFieldKey, unknown>> = {};
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') {
changes['GPSLatitudeRef'] = value.latitude >= 0 ? 'N' : 'S';
changes['GPSLatitude'] = piexif.GPSHelper.degToDmsRational(value.latitude);
} else E{
changes[def.infer.latitude.exif] = value.latitude;
}
// XXX harcoded BS :/
if (def.infer.longitude.exif === 'GPSLongitude') {
changes['GPSLongitudeRef'] = value.longitude >= 0 ? 'E' : 'W';
changes['GPSLongitude'] = piexif.GPSHelper.degToDmsRational(value.longitude);
} else E{
changes[def.infer.longitude.exif] = value.longitude;
}
} else {
changes[def.infer.exif] = value;
}
}
return setExifFields(bytes, changes);
}
export function setExifFields(bytes: ArrayBuffer, changes: Partial<Record<ExifFieldKey, unknown>>) {
const bytestring = byteString(new Uint8Array(bytes));
try {
const exifDict = piexif.load(bytestring);
// Prevent any write if no exif data changed
let dirty = false;
for (const [key, value] of Object.entries(changes)) {
const field = EXIF_FIELDS[key];
const [category] =
Object.entries(exifDict).find(([, tags]) => tags && field in tags) ??
Object.entries(piexif.TAGS).find(
([cat, tags]) => cat !== 'Image' && field in tags
) ??
[];
Iif (!category) continue;
const serialized = serializeExifValue(value);
Iif (serialized === undefined) continue;
if (serialized === exifDict[category][field]) continue;
exifDict[category][field] = serialized;
dirty = true;
}
Iif (!dirty) return new Uint8Array(bytes);
const outputstr = piexif.insert(piexif.dump(exifDict), bytestring);
return byteStringToArray(outputstr);
} catch (error) {
toasts.warn(errorMessage(error, 'Impossible de modifier les données EXIF'));
return new Uint8Array(buffer);
}
}
/**
* aperture value = 2 log_2(f number)
* @see https://www.uniquephoto.com/community/qa/what-is-aperture-value-in-exif-and-how-does-it-relate-to-the-f-number
*/
export function apertureValueToFNumber(aperture: number): number {
return 2 ** (aperture / 2);
}
// son son son sahur
// See https://gist.github.com/gwennlbh/b907a5fc4e139f12ddb2c677984a4a83#file-img_6072-cr2-json-L190-L195
function avoidSentinelTemperature(value: number | undefined): number | undefined {
if (value === -1000) {
console.debug(`Avoiding sentinel value -1000°C for temperature`);
return undefined;
}
return value;
}
|