commit current backend

slader-legacy-backend/src/config.ts

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+require('dotenv').config()
+let appConfig = {
+    port: parseInt(process.env.SL_PORT as any)
+}
+export {appConfig}

slader-legacy-backend/src/entity-fill.ts

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+import {IExercise, ITextbook, IToc} from "./types"
+
+export function fillIToc(single: any) {
+    return <IToc>{
+        section: single.section,
+        count: single.count,
+        pageBegin: single.pageBegin,
+        pageEnd: single.pageEnd
+    }
+}
+
+export function fillITextbook(single: any) {
+    return <ITextbook>{
+        title: single.title,
+        quantity: single.quantity
+    }
+}
+
+export function fillIExercise(single: any) {
+    return <IExercise>{
+        exercise: single.exercise,
+        section: single.section,
+        part: single.part,
+        page: single.page,
+        html: single.html
+    }
+}

slader-legacy-backend/src/includes.ts

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+import {validationResult} from "express-validator"
+import {IResultJson} from "./types"
+import express from "express"
+import Database from "better-sqlite3"
+import path from "path"
+
+let db = Database(path.join(__dirname, '../slader.db'), {verbose: message => console.log('SQLITE3: ' + message)})
+
+export {db}
+export const resultJson = {
+    success(data: any) {
+        return <IResultJson>{
+            status: true,
+            data: data
+        }
+    },
+    error(data: any) {
+        return <IResultJson>{
+            status: false,
+            data: data
+        }
+    }
+}
+
+export function hasValidationErrors(req: express.Request, res: express.Response) {
+    let errors = validationResult(req)
+    if (!errors.isEmpty()) {
+        res.json(resultJson.error(errors.array()))
+        return true
+    }
+    return false
+}
+
+export function getTimestampInSeconds() {
+    return Math.floor(Date.now() / 1000)
+}

slader-legacy-backend/src/index.ts

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+import express from 'express'
+import cors from 'cors'
+import {textbookRouter} from "./routers/textbook-router"
+import {appConfig} from "./config"
+
+let app = express()
+app.use(cors())
+
+app.use('/textbook', textbookRouter)
+
+app.listen(appConfig.port, () => {
+    console.log('Server has started at port ' + appConfig.port)
+})

slader-legacy-backend/src/models/textbook-model.ts

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+import 'reflect-metadata'
+import {Service} from "typedi"
+import {db} from "../includes"
+import {fillIExercise, fillITextbook, fillIToc} from "../entity-fill"
+import {text} from "express"
+
+@Service()
+export class TextbookModel {
+    existTextbook(textbook: string) {
+        let raw = db.prepare('select rowid from solutions where textbook=? limit 1').get(textbook)
+        return !!raw?.rowid
+    }
+
+    existSection(textbook: string, section: string) {
+        let raw = db.prepare('select rowid from solutions where textbook=? and section=? limit 1').get(textbook, section)
+        return !!raw?.rowid
+    }
+
+    existExercise(textbook: string, section: string, exercise: string) {
+        let raw = db.prepare('select rowid from solutions ' +
+            'where textbook=? and section=? and exercise=? limit 1').get(textbook, section, exercise)
+        return !!raw?.rowid
+    }
+
+    getTextbooks() {
+        let raw = db.prepare('SELECT textbook as title,count(rowid) as quantity from solutions GROUP BY textbook').all()
+        return raw.map(value => fillITextbook(value))
+    }
+
+    findExercisesByTextbookSection(textbook: string, section: string) {
+        let raw = db.prepare('SELECT exercise,section,part,page,html ' +
+            'from solutions ' +
+            'where textbook=? ' +
+            'and section=? order by exercise asc').all(textbook, section)
+        return raw.map(value => fillIExercise(value))
+    }
+
+    findExercise(textbook: string, section: string, exercise: string) {
+        let raw = db.prepare('SELECT exercise,section,part,page,html ' +
+            'from solutions ' +
+            'where textbook=? ' +
+            'and section=? and exercise=?').get(textbook, section, exercise)
+        return fillIExercise(raw)
+    }
+
+    findExercisesByTextbookPage(textbook: string, page: number) {
+        let raw = db.prepare('SELECT exercise,section,part,page,html ' +
+            'from solutions ' +
+            'where textbook=? ' +
+            'and page=? order by exercise asc').all(textbook, page)
+        return raw.map(value => fillIExercise(value))
+    }
+
+    findTocByTextbook(textbook: string) {
+        let raw = db.prepare('SELECT section, ' +
+            'count(rowid) as count, ' +
+            'min(page) as pageBegin, ' +
+            'max(page) as pageEnd ' +
+            'FROM "solutions" ' +
+            'where textbook=? ' +
+            'group by section ' +
+            'order by pageBegin asc').all(textbook)
+        return raw.map(value => fillIToc(value))
+    }
+}

slader-legacy-backend/src/routers/textbook-router.ts

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+import 'reflect-metadata'
+import express from "express"
+import {param, query} from "express-validator"
+import {Container} from "typedi"
+import {TextbookModel} from "../models/textbook-model"
+import expressAsyncHandler from "express-async-handler"
+import {TextbookService} from "../services/textbook-service"
+import {hasValidationErrors} from "../includes"
+
+let textbookRouter = express.Router()
+let textbookModel = Container.get(TextbookModel)
+let textbookService = Container.get(TextbookService)
+textbookRouter.get('/',
+    expressAsyncHandler(async (req: express.Request, res: express.Response) => {
+        res.json(await textbookService.listTextbooks())
+    })
+)
+textbookRouter.get('/:textbook/:section?/:exercise?',
+    param('textbook').notEmpty().bail().custom(input => {
+        if (!textbookModel.existTextbook(input)) {
+            throw new Error('textbook not exist')
+        }
+        return true
+    }),
+    query('page').optional().isInt({min: 1}),
+    param('section').optional().notEmpty().bail().custom((input, {req}) => {
+        if (!textbookModel.existSection(req.params!.textbook, input)) {
+            throw new Error('section not exist')
+        }
+        return true
+    }),
+    param('exercise').optional().notEmpty().bail().custom((input, {req}) => {
+        if (!textbookModel.existExercise(req.params!.textbook, req.params!.section, input)) {
+            throw new Error('exercise not exist')
+        }
+        return true
+    }),
+    expressAsyncHandler(async (req: express.Request, res: express.Response) => {
+        if (hasValidationErrors(req, res)) return
+        if (req.query.page) {
+            res.json(await textbookService.getPage(req.params.textbook, Number(req.query.page)))
+        } else if (req.params.exercise) {
+            res.json(await textbookService.getExercise(req.params.textbook, req.params.section, req.params.exercise))
+        } else if (req.params.section) {
+            res.json(await textbookService.getSection(req.params.textbook, req.params.section))
+        } else {
+            res.json(await textbookService.getTextbook(req.params.textbook))
+        }
+    })
+)
+
+
+export {textbookRouter}

slader-legacy-backend/src/services/textbook-service.ts

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+import 'reflect-metadata'
+import {Inject, Service} from "typedi"
+import {TextbookModel} from "../models/textbook-model"
+import {resultJson} from "../includes"
+
+@Service()
+export class TextbookService {
+    @Inject()
+    textbookModel!: TextbookModel
+
+    async getTextbook(textbook: string) {
+        return resultJson.success(this.textbookModel.findTocByTextbook(textbook))
+    }
+
+    async getSection(textbook: string, section: string) {
+        return resultJson.success(this.textbookModel.findExercisesByTextbookSection(textbook, section))
+    }
+
+    async getExercise(textbook: string, section: string, exercise: string) {
+        return resultJson.success(this.textbookModel.findExercise(textbook, section, exercise))
+    }
+
+    async getPage(textbook: string, page: number) {
+        return resultJson.success(this.textbookModel.findExercisesByTextbookPage(textbook, page))
+    }
+
+    async listTextbooks() {
+        return resultJson.success(this.textbookModel.getTextbooks())
+    }
+}

slader-legacy-backend/src/types.ts

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+export interface IResultJson {
+    status: boolean,
+    data: any
+}
+
+export interface IToc {
+    section: string,
+    count: number,
+    pageBegin: number,
+    pageEnd: number
+}
+
+export interface ITextbook {
+    title: string,
+    quantity: number
+}
+
+export interface IExercise {
+    exercise: string,
+    section: string,
+    part: string,
+    page: number,
+    html: string
+}