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| 1 | +// Copyright (c) Argo Zhang (argo@163.com). All rights reserved. |
| 2 | +// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. |
| 3 | +// Website: https://www.blazor.zone or https://argozhang.github.io/ |
| 4 | + |
| 5 | +using Microsoft.Playwright; |
| 6 | + |
| 7 | +namespace BootstrapBlazor.Components; |
| 8 | + |
| 9 | +/// <summary> |
| 10 | +/// 默认 Html to Pdf 实现 |
| 11 | +/// </summary> |
| 12 | +class DefaultPdfService : IHtml2Pdf |
| 13 | +{ |
| 14 | + /// <summary> |
| 15 | + /// <inheritdoc/> |
| 16 | + /// </summary> |
| 17 | + public Task<byte[]> PdfDataAsync(string url) |
| 18 | + { |
| 19 | + return GeneratePdfFromUrlAsync(url); |
| 20 | + } |
| 21 | + |
| 22 | + /// <summary> |
| 23 | + /// <inheritdoc/> |
| 24 | + /// </summary> |
| 25 | + public async Task<Stream> PdfStreamAsync(string url) |
| 26 | + { |
| 27 | + var data = await GeneratePdfFromUrlAsync(url); |
| 28 | + return new MemoryStream(data); |
| 29 | + } |
| 30 | + |
| 31 | + /// <summary> |
| 32 | + /// Export method |
| 33 | + /// </summary> |
| 34 | + /// <param name="html">html raw string</param> |
| 35 | + /// <param name="links"></param> |
| 36 | + /// <param name="scripts"></param> |
| 37 | + public Task<byte[]> PdfDataFromHtmlAsync(string html, IEnumerable<string>? links = null, IEnumerable<string>? scripts = null) |
| 38 | + { |
| 39 | + return GeneratePdfFromHtmlAsync(html, links, scripts); |
| 40 | + } |
| 41 | + |
| 42 | + /// <summary> |
| 43 | + /// Export method |
| 44 | + /// </summary> |
| 45 | + /// <param name="html">html raw string</param> |
| 46 | + /// <param name="links"></param> |
| 47 | + /// <param name="scripts"></param> |
| 48 | + public async Task<Stream> PdfStreamFromHtmlAsync(string html, IEnumerable<string>? links = null, IEnumerable<string>? scripts = null) |
| 49 | + { |
| 50 | + var data = await PdfDataFromHtmlAsync(html, links, scripts); |
| 51 | + return new MemoryStream(data); |
| 52 | + } |
| 53 | + |
| 54 | + private static async Task<byte[]> GeneratePdfFromUrlAsync(string url) |
| 55 | + { |
| 56 | + using var playwright = await Playwright.CreateAsync(); |
| 57 | + await using var browser = await playwright.Chromium.LaunchAsync(CreateOptions()); |
| 58 | + |
| 59 | + await using var context = await browser.NewContextAsync(); |
| 60 | + var page = await context.NewPageAsync(); |
| 61 | + |
| 62 | + await page.GotoAsync(url, new PageGotoOptions { WaitUntil = WaitUntilState.NetworkIdle }); |
| 63 | + return await page.PdfAsync(new PagePdfOptions |
| 64 | + { |
| 65 | + Format = "A4", |
| 66 | + Landscape = false, |
| 67 | + }); |
| 68 | + } |
| 69 | + |
| 70 | + private static async Task<byte[]> GeneratePdfFromHtmlAsync(string html, IEnumerable<string>? links = null, IEnumerable<string>? scripts = null) |
| 71 | + { |
| 72 | + using var playwright = await Playwright.CreateAsync(); |
| 73 | + await using var browser = await playwright.Chromium.LaunchAsync(CreateOptions()); |
| 74 | + |
| 75 | + await using var context = await browser.NewContextAsync(); |
| 76 | + var page = await context.NewPageAsync(); |
| 77 | + |
| 78 | + await page.SetContentAsync(html); |
| 79 | + await AddStyleTagAsync(page, links); |
| 80 | + await AddScriptTagAsync(page, scripts); |
| 81 | + |
| 82 | + return await page.PdfAsync(new PagePdfOptions |
| 83 | + { |
| 84 | + Format = "A4", |
| 85 | + Landscape = false, |
| 86 | + }); |
| 87 | + } |
| 88 | + |
| 89 | + private static BrowserTypeLaunchOptions CreateOptions() => new() |
| 90 | + { |
| 91 | + Headless = true, |
| 92 | + Args = ["--no-sandbox", "--disable-setuid-sandbox", "--disable-web-security"] |
| 93 | + }; |
| 94 | + |
| 95 | + private static async Task AddStyleTagAsync(IPage page, IEnumerable<string>? links = null) |
| 96 | + { |
| 97 | + var styles = new List<string>(); |
| 98 | + |
| 99 | + if (links != null) |
| 100 | + { |
| 101 | + styles.AddRange(links); |
| 102 | + } |
| 103 | + |
| 104 | + foreach (var link in styles) |
| 105 | + { |
| 106 | + await page.AddStyleTagAsync(new PageAddStyleTagOptions() |
| 107 | + { |
| 108 | + Url = link, |
| 109 | + }); |
| 110 | + } |
| 111 | + } |
| 112 | + |
| 113 | + private static async Task AddScriptTagAsync(IPage page, IEnumerable<string>? scripts = null) |
| 114 | + { |
| 115 | + var tags = new List<string>(); |
| 116 | + |
| 117 | + if (scripts != null) |
| 118 | + { |
| 119 | + tags.AddRange(scripts); |
| 120 | + } |
| 121 | + |
| 122 | + foreach (var script in tags) |
| 123 | + { |
| 124 | + await page.AddScriptTagAsync(new PageAddScriptTagOptions() |
| 125 | + { |
| 126 | + Url = script, |
| 127 | + Type = "script" |
| 128 | + }); |
| 129 | + } |
| 130 | + } |
| 131 | +} |
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