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/*---------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All rights reserved.

* Licensed under the MIT License. See License.txt in the project root for license information.

*--------------------------------------------------------------------------------------------*/

import * as vscode from 'vscode';

import * as Octokit from '@octokit/rest';

import Logger from "../common/logger";

import { Remote } from "../common/remote";

import { PRType, IGitHubRepository } from "./interface";

import { PullRequestModel } from "./pullRequestModel";

import { CredentialStore } from './credentials';

import { AuthenticationError } from '../common/authentication';

import { parseRemote } from '../common/repository';

export const PULL_REQUEST_PAGE_SIZE = 20;

export interface PullRequestData {

pullRequests: PullRequestModel[];

hasMorePages: boolean;

}

export class GitHubRepository implements IGitHubRepository {

private _octokit: Octokit;

private _initialized: boolean;

public get octokit(): Octokit {

if (this._octokit === undefined) {

if (!this._initialized) {

throw new Error("Call ensure() before accessing this property.");

} else {

throw new AuthenticationError("Not authenticated.");

}

}

return this._octokit;

}

constructor(public remote: Remote, private readonly _credentialStore: CredentialStore) {

}

async resolveRemote(): Promise<void> {

try {

const { octokit, remote } = await this.ensure();

const { data } = await octokit.repos.get({

owner: remote.owner,

repo: remote.repositoryName

});

this.remote = parseRemote(remote.remoteName, data.clone_url);

} catch (e) {

Logger.appendLine(`Unable to resolve remote: ${e}`);

}

}

async ensure(): Promise<GitHubRepository> {

this._initialized = true;

if (!await this._credentialStore.hasOctokit(this.remote)) {

this._octokit = await this._credentialStore.loginWithConfirmation(this.remote);

} else {

this._octokit = await this._credentialStore.getOctokit(this.remote);

}

return this;

}

async authenticate(): Promise<boolean> {

this._initialized = true;

if (!await this._credentialStore.hasOctokit(this.remote)) {

this._octokit = await this._credentialStore.login(this.remote);

} else {

this._octokit = this._credentialStore.getOctokit(this.remote);

}

return this.octokit !== undefined;

}

async getDefaultBranch(): Promise<string> {

try {

const { octokit, remote } = await this.ensure();

const { data } = await octokit.repos.get({

owner: remote.owner,

repo: remote.repositoryName

});

return data.default_branch;

} catch (e) {

Logger.appendLine(`GitHubRepository> Fetching default branch failed: ${e}`);

}

return 'master';

}

async getPullRequests(prType: PRType, page?: number): Promise<PullRequestData> {

return prType === PRType.All ? this.getAllPullRequests(page) : this.getPullRequestsForCategory(prType, page);

}

private async getAllPullRequests(page?: number): Promise<PullRequestData> {

try {

const { octokit, remote } = await this.ensure();

const result = await octokit.pullRequests.getAll({

owner: remote.owner,

repo: remote.repositoryName,

per_page: PULL_REQUEST_PAGE_SIZE,

page: page || 1

});

const hasMorePages = !!result.headers.link && result.headers.link.indexOf('rel="next"') > -1;

const pullRequests = result.data.map(item => {

if (!item.head.repo) {

Logger.appendLine('GitHubRepository> The remote branch for this PR was already deleted.');

return null;

}

return new PullRequestModel(this, this.remote, item);

}).filter(item => item !== null);

return {

pullRequests,

hasMorePages

};

} catch (e) {

Logger.appendLine(`GitHubRepository> Fetching all pull requests failed: ${e}`);

if (e.code === 404) {

// not found

vscode.window.showWarningMessage(`Fetching pull requests for remote '${this.remote.remoteName}' failed, please check if the url ${this.remote.url} is valid.`);

} else {

throw e;

}

}

return null;

}

private async getPullRequestsForCategory(prType: PRType, page: number): Promise<PullRequestData> {

try {

const { octokit, remote } = await this.ensure();

const user = await octokit.users.get({});

// Search api will not try to resolve repo that redirects, so get full name first

const repo = await octokit.repos.get({ owner: this.remote.owner, repo: this.remote.repositoryName });

const { data, headers } = await octokit.search.issues({

q: this.getPRFetchQuery(repo.data.full_name, user.data.login, prType),

per_page: PULL_REQUEST_PAGE_SIZE,

page: page || 1

});

let promises = [];

data.items.forEach(item => {

promises.push(new Promise(async (resolve, reject) => {

let prData = await octokit.pullRequests.get({

owner: remote.owner,

repo: remote.repositoryName,

number: item.number

});

resolve(prData);

}));

});

const hasMorePages = !!headers.link && headers.link.indexOf('rel="next"') > -1;

const pullRequests = await Promise.all(promises).then(values => {

return values.map(item => {

if (!item.data.head.repo) {

Logger.appendLine('GitHubRepository> The remote branch for this PR was already deleted.');

return null;

}

return new PullRequestModel(this, this.remote, item.data);

}).filter(item => item !== null);

});

return {

pullRequests,

hasMorePages

};

} catch (e) {

Logger.appendLine(`GitHubRepository> Fetching all pull requests failed: ${e}`);

if (e.code === 404) {

// not found

vscode.window.showWarningMessage(`Fetching pull requests for remote ${this.remote.remoteName}, please check if the url ${this.remote.url} is valid.`);

} else {

throw e;

}

}

}

async getPullRequest(id: number): Promise<PullRequestModel> {

try {

const { octokit, remote } = await this.ensure();

let { data } = await octokit.pullRequests.get({

owner: remote.owner,

repo: remote.repositoryName,

number: id

});

if (!data.head.repo) {

Logger.appendLine('GitHubRepository> The remote branch for this PR was already deleted.');

return null;

}

return new PullRequestModel(this, remote, data);

} catch (e) {

Logger.appendLine(`GithubRepository> Unable to fetch PR: ${e}`);

return null;

}

}

private getPRFetchQuery(repo: string, user: string, type: PRType) {

let filter = '';

switch (type) {

case PRType.RequestReview:

filter = `review-requested:${user}`;

break;

case PRType.AssignedToMe:

filter = `assignee:${user}`;

break;

case PRType.Mine:

filter = `author:${user}`;

break;

default:

break;

}

return `is:open ${filter} type:pr repo:${repo}`;

}

}