eas-cli
Version:
EAS command line tool
108 lines (107 loc) • 3.41 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.isPNGAsync = exports.ensurePNGIsNotTransparentAsync = exports.ImageTransparencyError = exports.ImageNonPngError = void 0;
const tslib_1 = require("tslib");
const fs_extra_1 = tslib_1.__importDefault(require("fs-extra"));
const pngjs_1 = require("pngjs");
const fetch_1 = tslib_1.__importDefault(require("../fetch"));
class ImageNonPngError extends Error {
}
exports.ImageNonPngError = ImageNonPngError;
class ImageTransparencyError extends Error {
}
exports.ImageTransparencyError = ImageTransparencyError;
async function ensurePNGIsNotTransparentAsync(imagePathOrURL) {
let hasAlreadyResolved = false;
const stream = await getImageStreamAsync(imagePathOrURL);
let metadata;
await new Promise((res, rej) => {
stream
.pipe(new pngjs_1.PNG({ filterType: 4 }))
.on('error', err => {
if (err.message.match(/Invalid file signature/)) {
rej(new ImageNonPngError());
}
else {
rej(err);
}
})
.on('metadata', _metadata => {
metadata = _metadata;
const { alpha } = metadata;
if (!alpha) {
hasAlreadyResolved = true;
if (stream instanceof fs_extra_1.default.ReadStream) {
stream.close();
}
res();
}
})
.on('parsed', (png) => {
if (hasAlreadyResolved) {
return;
}
try {
// metadata should be set but assume the png is fine if it's not available
if (!metadata) {
res();
return;
}
validateAlphaChannelIsEmpty(png, { width: metadata.width, height: metadata.height });
res();
}
catch (err) {
rej(err);
}
});
});
}
exports.ensurePNGIsNotTransparentAsync = ensurePNGIsNotTransparentAsync;
async function isPNGAsync(imagePathOrURL) {
const stream = await getImageStreamAsync(imagePathOrURL);
return await new Promise((res, rej) => {
stream
.pipe(new pngjs_1.PNG({ filterType: 4 }))
.on('error', err => {
if (err.message.match(/Invalid file signature/)) {
res(false);
}
else {
rej(err);
}
})
.on('parsed', () => {
res(true);
});
});
}
exports.isPNGAsync = isPNGAsync;
async function getImageStreamAsync(imagePathOrURL) {
if (isURL(imagePathOrURL)) {
const response = await (0, fetch_1.default)(imagePathOrURL);
return response.body;
}
else {
return fs_extra_1.default.createReadStream(imagePathOrURL);
}
}
function isURL(imagePathOrURL) {
try {
// eslint-disable-next-line no-new
new URL(imagePathOrURL);
return true;
}
catch {
return false;
}
}
function validateAlphaChannelIsEmpty(data, { width, height }) {
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const idx = (width * y + x) * 4;
if (data[idx + 3] !== 255) {
throw new ImageTransparencyError();
}
}
}
}