expo-cached-image/lib/index.js

Super fast cached image component for react-native applications powered by expo

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import * as FileSystem from "expo-file-system";
import React, { useEffect, useRef, useState } from "react";
import { Image } from "react-native";
import * as CONST from "./consts";
var CachedImage = function (props) {
    var source = props.source, cacheKey = props.cacheKey, placeholderContent = props.placeholderContent, rest = __rest(props, ["source", "cacheKey", "placeholderContent"]);
    var uri = source.uri, headers = source.headers, expiresIn = source.expiresIn;
    var sanitizedKey = CONST.sanitizeCacheKey(cacheKey);
    var fileURI = "".concat(CONST.IMAGE_CACHE_FOLDER).concat(sanitizedKey, ".png");
    var _a = useState(fileURI), imgUri = _a[0], setImgUri = _a[1];
    var componentIsMounted = useRef(false);
    var requestOption = headers ? { headers: headers } : undefined;
    useEffect(function () {
        componentIsMounted.current = true;
        void loadImageAsync();
        return function () {
            componentIsMounted.current = false;
        };
    }, []);
    var loadImageAsync = function () { return __awaiter(void 0, void 0, void 0, function () {
        var metadata, expired, response, err_1;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    _a.trys.push([0, 7, , 8]);
                    return [4 /*yield*/, FileSystem.getInfoAsync(fileURI)];
                case 1:
                    metadata = _a.sent();
                    expired = Boolean((metadata === null || metadata === void 0 ? void 0 : metadata.exists) &&
                        expiresIn &&
                        new Date().getTime() / 1000 - metadata.modificationTime > expiresIn);
                    if (!(!(metadata === null || metadata === void 0 ? void 0 : metadata.exists) || (metadata === null || metadata === void 0 ? void 0 : metadata.size) === 0 || expired)) return [3 /*break*/, 6];
                    return [4 /*yield*/, setImgUri(null)];
                case 2:
                    _a.sent();
                    if (!componentIsMounted.current) return [3 /*break*/, 6];
                    if (!expired) return [3 /*break*/, 4];
                    return [4 /*yield*/, FileSystem.deleteAsync(fileURI, { idempotent: true })];
                case 3:
                    _a.sent();
                    _a.label = 4;
                case 4: return [4 /*yield*/, FileSystem.downloadAsync(uri, fileURI, requestOption)];
                case 5:
                    response = _a.sent();
                    if (componentIsMounted.current && (response === null || response === void 0 ? void 0 : response.status) === 200) {
                        setImgUri("".concat(fileURI));
                    }
                    if ((response === null || response === void 0 ? void 0 : response.status) !== 200) {
                        FileSystem.deleteAsync(fileURI, { idempotent: true });
                    }
                    _a.label = 6;
                case 6: return [3 /*break*/, 8];
                case 7:
                    err_1 = _a.sent();
                    console.error("Error loading image:", err_1);
                    setImgUri(uri);
                    return [3 /*break*/, 8];
                case 8: return [2 /*return*/];
            }
        });
    }); };
    if (!imgUri)
        return placeholderContent || null;
    return (<Image {...rest} source={__assign(__assign({}, source), { uri: imgUri })}/>);
};
export var CacheManager = {
    addToCache: function (_a) { return __awaiter(void 0, [_a], void 0, function (_b) {
        var sanitizedKey;
        var file = _b.file, key = _b.key;
        return __generator(this, function (_c) {
            switch (_c.label) {
                case 0:
                    sanitizedKey = CONST.sanitizeCacheKey(key);
                    return [4 /*yield*/, FileSystem.copyAsync({
                            from: file,
                            to: "".concat(CONST.IMAGE_CACHE_FOLDER).concat(sanitizedKey, ".png"),
                        })];
                case 1:
                    _c.sent();
                    return [4 /*yield*/, CacheManager.getCachedUri({ key: key })];
                case 2: return [2 /*return*/, _c.sent()];
            }
        });
    }); },
    getCachedUri: function (_a) { return __awaiter(void 0, [_a], void 0, function (_b) {
        var sanitizedKey;
        var key = _b.key;
        return __generator(this, function (_c) {
            switch (_c.label) {
                case 0:
                    sanitizedKey = CONST.sanitizeCacheKey(key);
                    return [4 /*yield*/, FileSystem.getContentUriAsync("".concat(CONST.IMAGE_CACHE_FOLDER).concat(sanitizedKey, ".png"))];
                case 1: return [2 /*return*/, _c.sent()];
            }
        });
    }); },
    downloadAsync: function (_a) { return __awaiter(void 0, [_a], void 0, function (_b) {
        var sanitizedKey;
        var uri = _b.uri, key = _b.key, options = _b.options;
        return __generator(this, function (_c) {
            switch (_c.label) {
                case 0:
                    sanitizedKey = CONST.sanitizeCacheKey(key);
                    return [4 /*yield*/, FileSystem.downloadAsync(uri, "".concat(CONST.IMAGE_CACHE_FOLDER).concat(sanitizedKey, ".png"), options)];
                case 1: return [2 /*return*/, _c.sent()];
            }
        });
    }); },
};
export default CachedImage;