flagnote-web/src/libs/page.js

import { getStoreKey } from "@/api/lock";
import storage from "@/libs/storage";
import { getNoteMetaNew, getNoteBlob } from "@/api/note";
import { reject } from "bluebird";
import { unwrap, md5 } from '@/libs/secret'


export async function initPageData(view) {

    let noteKey = view.noteForm.key;

    let storeKey = getStoreKey(noteKey);
    view.secret.storeKey = storeKey;

    let keyMeta = storage.session.getObject("keyMeta");
    if (keyMeta) {
        view.state.lock = 0;
        view.secret.cipher = keyMeta.cipher;
        view.secret.secretKey = keyMeta.secretKey;
        view.state.serverTime = keyMeta.serverTime;
        // key init Time
        view.state.initTime = keyMeta.serverTime;

        await storage.local.setText(storeKey, "0|" + view.secret.cipher + "|0|" + view.state.initTime + "|");
        storage.session.delete("keyMeta");
        return "000000";
    }

    let noteMeta = storage.session.getObject(noteKey+".noteMeta");

    if(null==noteMeta){
        let resp = await getNoteMetaNew(view.noteForm.key);
        if (null == resp || null == resp.data) {
            return "100006";
        }
        let result = resp.data;
        if (result.code != '000000') {
            return result.code;
        }
        let noteMeta = result.data;
        if (null == noteMeta) {
            return "100001";
        }
        if (null == noteMeta.key) {
            return "100002";
        }
        storage.session.setObject(noteKey+".noteMeta",noteMeta);
    }else{
        getNoteMetaNew(view.noteForm.key).then(function(resp){
            if (null == resp || null == resp.data) {
                return "100006";
            }
            let result = resp.data;
            if (result.code != '000000') {
                return result.code;
            }
            let noteMeta = result.data;
            if (null == noteMeta) {
                return "100001";
            }
            if (null == noteMeta.key) {
                return "100002";
            }
        });
    }

    //view
    if (1 == noteMeta.state) {

        view.secret.secretKey = noteMeta.secretKey;

        view.state.lock = noteMeta.lock;
        view.state.initTime = new Date().getTime();
        view.state.initTtl = noteMeta.ttl;
        view.state.ttl = noteMeta.ttl;
        view.state.serverTime = noteMeta.serverTime;

        view.secret.cipher = "00000000000000000000000000000000";//noteMeta.cipher; //读者有没有值可配置
        view.secret.md5 = noteMeta.md5;

        await loadText(view);
        return "000000";
    }

    //deleted
    if (0 == noteMeta.state) {
        let storeKey = getStoreKey(noteKey);
        storage.local.delete(storeKey);
        // user deleted
        if (noteMeta.ttl > 0) {
            // errorMeta = 100003;
            return "100003";
            //return errorRouter(100003);
        } else {// timeout
            // errorMeta = 100004;
            return "100004";
            //return errorRouter(100004);
        }
    }

    //edit or unsubmitted
    if (null == noteMeta.state) {
        let storeKey = getStoreKey(noteKey);
        const storeInfo = await storage.local.getText(storeKey);

        //if has storage , then edit
        if (null != storeInfo) {
            view.secret.secretKey = noteMeta.secretKey;

            let starray = storeInfo.split('|');
            view.state.lock = parseInt(starray[0]);
            view.secret.cipher = starray[1];
            view.state.initTime = parseInt(starray[3]);
            //draw text;
            if (starray[4]) {
                view.noteForm.text = unwrap(starray[4], view.secret.secretKey);
            }

            return "000000";
        }

        //storage is empty 
        let df = storage.session.getText(storeKey + "_delete")
        if (df) {//unsubmitted,user deleted.
            // errorMeta = 100003;
            return "100003";
        } else {//unsubmitted
            // errorMeta = 100005;
            return "100005";
        }
    }


}

async function loadText(view) {

    let storeInfo = await storage.local.getText(view.secret.storeKey);

    let starray = [];
    if (storeInfo) {
        starray = storeInfo.split('|');
    }

    if (!storeInfo || !starray[4] || (md5(starray[4]) != view.secret.md5)) {

        let bytesString = await getServerNote(view.noteForm.key);
        view.noteForm.text = unwrap(bytesString, view.secret.secretKey);
    } else {
        starray = storeInfo.split('|');

        if (!starray[4]) {
            return;
        }

        view.noteForm.text = unwrap(starray[4], view.secret.secretKey);
        //this.noteForm.escapeText = getEscapeText(this.noteForm.text);

        // local is usable, and set commited flag
        if ("0" == starray[2]) {
            storage.local.setText(this.secret.storeKey, starray[0] + "|" + starray[1] + "|1|" + starray[3] + "|" + starray[4]);
        }
    }
}

async function getServerNote(key) {
    let resp = await getNoteBlob(key)
    if (!resp.data || resp.data.size == 0) {
        return "100006";
    }

    let blob = new Blob([resp.data], {
        type: resp.data.type
    });

    let bytesString = await fileReader(blob);

    return bytesString;


}

async function fileReader(blob) {
    return new Promise(function (resolve) {
        let reader = new FileReader();
        reader.onload = function (e) {
            if (!e.target.result || e.target.result.byteLength == 0) {
                reject("");
            }
            var bytes = new Uint8Array(e.target.result);
            bytes = bytes.subarray(7, bytes.length - 7);
            let bytesString = bytes.join(",");
            resolve(bytesString);
        };
        reader.readAsArrayBuffer(blob)
    });
}