feat: use lazy loading for juice library (also in composer), and fix size handling in message view

frontend/package-lock.json

@@ -17,6 +17,7 @@
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@@ -3216,6 +3321,46 @@
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@@ -3326,6 +3471,32 @@
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@@ -3709,6 +3954,17 @@
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+    "node_modules/mime": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.6.0.tgz",
+      "integrity": "sha512-USPkMeET31rOMiarsBNIHZKLGgvKc/LrjofAnBlOttf5ajRvqiRA8QsenbcooctK6d6Ts6aqZXBA+XbkKthiQg==",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
     "node_modules/minimatch": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
@@ -5338,6 +5677,17 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/nth-check": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/nth-check/-/nth-check-2.1.1.tgz",
+      "integrity": "sha512-lqjrjmaOoAnWfMmBPL+XNnynZh2+swxiX3WUE0s4yEHI6m+AwrK2UZOimIRl3X/4QctVqS8AiZjFqyOGrMXb/w==",
+      "dependencies": {
+        "boolbase": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/nth-check?sponsor=1"
+      }
+    },
     "node_modules/object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -5513,6 +5863,40 @@
         "node": ">=6"
       }
     },
+    "node_modules/parse5": {
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.2.1.tgz",
+      "integrity": "sha512-BuBYQYlv1ckiPdQi/ohiivi9Sagc9JG+Ozs0r7b/0iK3sKmrb0b9FdWdBbOdx6hBCM/F9Ir82ofnBhtZOjCRPQ==",
+      "dependencies": {
+        "entities": "^4.5.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
+    "node_modules/parse5-htmlparser2-tree-adapter": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/parse5-htmlparser2-tree-adapter/-/parse5-htmlparser2-tree-adapter-7.1.0.tgz",
+      "integrity": "sha512-ruw5xyKs6lrpo9x9rCZqZZnIUntICjQAd0Wsmp396Ul9lN/h+ifgVV1x1gZHi8euej6wTfpqX8j+BFQxF0NS/g==",
+      "dependencies": {
+        "domhandler": "^5.0.3",
+        "parse5": "^7.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
+    "node_modules/parse5-parser-stream": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/parse5-parser-stream/-/parse5-parser-stream-7.1.2.tgz",
+      "integrity": "sha512-JyeQc9iwFLn5TbvvqACIF/VXG6abODeB3Fwmv/TGdLk2LfbWkaySGY72at4+Ty7EkPZj854u4CrICqNk2qIbow==",
+      "dependencies": {
+        "parse5": "^7.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "node_modules/path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -6245,6 +6629,11 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
+    },
     "node_modules/scheduler": {
       "version": "0.23.2",
       "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
@@ -6345,6 +6734,14 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/slick": {
+      "version": "1.12.2",
+      "resolved": "https://registry.npmjs.org/slick/-/slick-1.12.2.tgz",
+      "integrity": "sha512-4qdtOGcBjral6YIBCWJ0ljFSKNLz9KkhbWtuGvUyRowl1kxfuE1x/Z/aJcaiilpb3do9bl5K7/1h9XC5wWpY/A==",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -6859,6 +7256,14 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/undici": {
+      "version": "6.20.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.20.1.tgz",
+      "integrity": "sha512-AjQF1QsmqfJys+LXfGTNum+qw4S88CojRInG/6t31W/1fk6G59s92bnAvGz5Cmur+kQv2SURXEvvudLmbrE8QA==",
+      "engines": {
+        "node": ">=18.17"
+      }
+    },
     "node_modules/unfetch": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/unfetch/-/unfetch-5.0.0.tgz",
@@ -6957,6 +7362,14 @@
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "dev": true
     },
+    "node_modules/valid-data-url": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/valid-data-url/-/valid-data-url-3.0.1.tgz",
+      "integrity": "sha512-jOWVmzVceKlVVdwjNSenT4PbGghU0SBIizAev8ofZVgivk/TVHXSbNL8LP6M3spZvkR9/QolkyJavGSX5Cs0UA==",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/validator": {
       "version": "13.12.0",
       "resolved": "https://registry.npmjs.org/validator/-/validator-13.12.0.tgz",
@@ -7032,6 +7445,130 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/web-resource-inliner": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/web-resource-inliner/-/web-resource-inliner-7.0.0.tgz",
+      "integrity": "sha512-NlfnGF8MY9ZUwFjyq3vOUBx7KwF8bmE+ywR781SB0nWB6MoMxN4BA8gtgP1KGTZo/O/AyWJz7HZpR704eaj4mg==",
+      "dependencies": {
+        "ansi-colors": "^4.1.1",
+        "escape-goat": "^3.0.0",
+        "htmlparser2": "^5.0.0",
+        "mime": "^2.4.6",
+        "valid-data-url": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/dom-serializer": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.4.1.tgz",
+      "integrity": "sha512-VHwB3KfrcOOkelEG2ZOfxqLZdfkil8PtJi4P8N2MMXucZq2yLp75ClViUlOVwyoHEDjYU433Aq+5zWP61+RGag==",
+      "dependencies": {
+        "domelementtype": "^2.0.1",
+        "domhandler": "^4.2.0",
+        "entities": "^2.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/cheeriojs/dom-serializer?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/dom-serializer/node_modules/domhandler": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.3.1.tgz",
+      "integrity": "sha512-GrwoxYN+uWlzO8uhUXRl0P+kHE4GtVPfYzVLcUxPL7KNdHKj66vvlhiweIHqYYXWlw+T8iLMp42Lm67ghw4WMQ==",
+      "dependencies": {
+        "domelementtype": "^2.2.0"
+      },
+      "engines": {
+        "node": ">= 4"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domhandler?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/domhandler": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-3.3.0.tgz",
+      "integrity": "sha512-J1C5rIANUbuYK+FuFL98650rihynUOEzRLxW+90bKZRWB6A1X1Tf82GxR1qAWLyfNPRvjqfip3Q5tdYlmAa9lA==",
+      "dependencies": {
+        "domelementtype": "^2.0.1"
+      },
+      "engines": {
+        "node": ">= 4"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domhandler?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/domutils": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-2.8.0.tgz",
+      "integrity": "sha512-w96Cjofp72M5IIhpjgobBimYEfoPjx1Vx0BSX9P30WBdZW2WIKU0T1Bd0kz2eNZ9ikjKgHbEyKx8BB6H1L3h3A==",
+      "dependencies": {
+        "dom-serializer": "^1.0.1",
+        "domelementtype": "^2.2.0",
+        "domhandler": "^4.2.0"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domutils?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/domutils/node_modules/domhandler": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-4.3.1.tgz",
+      "integrity": "sha512-GrwoxYN+uWlzO8uhUXRl0P+kHE4GtVPfYzVLcUxPL7KNdHKj66vvlhiweIHqYYXWlw+T8iLMp42Lm67ghw4WMQ==",
+      "dependencies": {
+        "domelementtype": "^2.2.0"
+      },
+      "engines": {
+        "node": ">= 4"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/domhandler?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/entities": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-2.2.0.tgz",
+      "integrity": "sha512-p92if5Nz619I0w+akJrLZH0MX0Pb5DX39XOwQTtXSdQQOaYH03S1uIQp4mhOZtAXrxq4ViO67YTiLBo2638o9A==",
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "node_modules/web-resource-inliner/node_modules/htmlparser2": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-5.0.1.tgz",
+      "integrity": "sha512-vKZZra6CSe9qsJzh0BjBGXo8dvzNsq/oGvsjfRdOrrryfeD9UOBEEQdeoqCRmKZchF5h2zOBMQ6YuQ0uRUmdbQ==",
+      "dependencies": {
+        "domelementtype": "^2.0.1",
+        "domhandler": "^3.3.0",
+        "domutils": "^2.4.2",
+        "entities": "^2.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/htmlparser2?sponsor=1"
+      }
+    },
+    "node_modules/whatwg-encoding": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+      "integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",

frontend/package.json

@@ -20,6 +20,7 @@
     "i18next": "^23.15.2",
     "i18next-browser-languagedetector": "^8.0.0",
     "i18next-resources-to-backend": "^1.2.1",
+    "juice": "^11.0.0",
     "lucide-react": "^0.451.0",
     "prop-types": "^15.8.1",
     "react": "^18.3.1",
@@ -34,7 +35,9 @@
     "validator": "^13.12.0"
   },
   "devDependencies": {
+    "@csstools/postcss-is-pseudo-class": "^5.0.1",
     "@eslint/js": "^9.11.1",
+    "@tailwindcss/typography": "^0.5.15",
     "@types/react": "^18.3.10",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-legacy": "^5.4.2",

frontend/postcss.config.js

@@ -1,6 +1,10 @@
 export default {
   plugins: {
     tailwindcss: {},
+    "./postcss/transform-pseudoclass.js": {},
+    "@csstools/postcss-is-pseudo-class": {
+      preserve: true
+    },
     autoprefixer: {},
     "postcss-css-variables": {
       preserve: true

frontend/postcss/package.json

@@ -0,0 +1 @@
+{}

frontend/postcss/transform-pseudoclass.js

@@ -0,0 +1,17 @@
+module.exports = (opts = {}) => {
+  return {
+    postcssPlugin: 'postcss-where-to-is-and-prefix',
+    Once(root, { result }) {
+      root.walkRules((rule) => {
+        rule.selector = rule.selector.replace(/\:where\(([^)]*)\)/g, ':is($1)');
+        if (rule.selector.match(/\:is\([^)]*\)/)) {
+          rule.selector = rule.selector + ", " +
+            rule.selector.replace(/\:is\(([^)]*)\)/g, ':-moz-any($1)') + ", " + 
+            rule.selector.replace(/\:is\(([^)]*)\)/g, ':-webkit-any($1)')
+        }
+      });
+    }
+  }
+};
+
+module.exports.postcss = true;

frontend/src/contexts/ThemeContext.jsx

@@ -46,7 +46,7 @@ const ThemeProvider = ({ children }) => {
 
   return (
     <ThemeContext.Provider
-      value={{ currentTheme, setTheme, areThemesSupported }}
+      value={{ currentTheme, setTheme, areThemesSupported, isDarkMode }}
     >
       {children}
     </ThemeContext.Provider>

frontend/src/layouts/content/Compose.jsx

@@ -156,8 +156,13 @@ function ComposeContent() {
         }
         if (messageData) {
           const message = messageData.messages[messageData.messages.length - 1];
-          const sanitizedBody = DOMPurify.sanitize(message.body, {
+          const inlinedBody = (await import("juice/client")).default(
-            WHOLE_DOCUMENT: true
+            message.body
+          );
+          const sanitizedBody = DOMPurify.sanitize(inlinedBody, {
+            WHOLE_DOCUMENT: true,
+            FORBID_TAGS: ["style"],
+            FORBID_ATTR: ["class"]
           });
           const parsedBody = new DOMParser().parseFromString(
             sanitizedBody,
@@ -564,7 +569,7 @@ function ComposeContent() {
                 cc: ccValues,
                 bcc: bccValues,
                 subject: subject,
-                content: contents,
+                content: `<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width, initial-scale=1.0" /></head><body>${contents}</body></html>`,
                 inReplyTo: inReplyTo,
                 attachments: finalAttachments,
                 draftMailbox: draftMailbox,
@@ -1077,7 +1082,7 @@ function ComposeContent() {
                     cc: ccValues,
                     bcc: bccValues,
                     subject: subject,
-                    content: contents,
+                    content: `<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width, initial-scale=1.0" /></head><body>${contents}</body></html>`,
                     inReplyTo: inReplyTo,
                     attachments: finalAttachments,
                     draftMailbox: draftMailbox,

frontend/src/layouts/content/Message.jsx

@@ -13,8 +13,8 @@ import {
   Trash,
   TriangleAlert
 } from "lucide-react";
-import { useCallback, useContext, useEffect, useRef, useState } from "react";
+import { useContext, useEffect, useState } from "react";
-import Iframe from "@/components/Iframe.jsx";
+import { ThemeContext } from "@/contexts/ThemeContext.jsx";
 import { useTranslation } from "react-i18next";
 import DOMPurify from "dompurify";
 import { filesize } from "filesize";
@@ -26,10 +26,10 @@ import Loading from "@/components/Loading.jsx";
 import download from "downloadjs";
 
 function MessageContent() {
-  const iframeRef = useRef({});
-  const [iframeHeights, setIframeHeights] = useState({});
   const { t } = useTranslation();
+  const { isDarkMode } = useContext(ThemeContext);
   const { toast } = useContext(ToastContext);
+  const [juice, setJuice] = useState(null);
   const [moveShown, setMoveShown] = useState(false);
   const view = useSelector((state) => state.view.view);
   const hasMoreThanOneMailbox = useSelector(
@@ -99,94 +99,70 @@ function MessageContent() {
     }
   }, [refresh, loading, dispatch]);
 
-  const replaceCIDsOnIframeLoad = (iframeRefContents, id, attachments) => {
+  const isLightOrDark = (rgbColor) => {
-    return () => {
+    let [r, g, b] = rgbColor;
-      const srcElements =
+    let hsp = Math.sqrt(0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b));
-        iframeRefContents.contentWindow.document.querySelectorAll("[src]");
+    return hsp > 127.5 ? "light" : "dark";
-      srcElements.forEach((srcElement) => {
-        if (srcElement.src) {
-          const cidMatch = srcElement.src.match(/^cid:(.+)/);
-          if (cidMatch) {
-            const cid = cidMatch[1];
-            const attachment = attachments.find((attachment) => {
-              return attachment.contentId == cid;
-            });
-            if (attachment) {
-              srcElement.src = `/api/receive/attachment/${attachment.id}`;
-              // Add onload event listener to images with CIDs, so that iframe heights are not broken
-              srcElement.addEventListener("load", () => {
-                resizeOnIframeLoad(iframeRefContents, id)();
-              });
-            }
-          }
-        }
-      });
-    };
   };
 
-  const processLinksAndFormsOnIframeLoad = (iframeRefContents) => {
+  const flipLightness = (rgb) => {
-    return () => {
+    // Convert RGB to HSL
-      const aElements =
+    let r = rgb[0] / 255;
-        iframeRefContents.contentWindow.document.querySelectorAll("a");
+    let g = rgb[1] / 255;
-      aElements.forEach((aElement) => {
+    let b = rgb[2] / 255;
-        const currentHashURL =
-          document.location.origin + document.location.pathname + "#";
-        if (
-          !aElement.href ||
-          aElement.href.slice(0, 1) == "#" ||
-          aElement.href.slice(0, currentHashURL.length) == currentHashURL
-        ) {
-          // Prevent changing the URL
-          aElement.addEventListener("click", (e) => {
-            e.preventDefault();
-          });
-          aElement.target = "_self";
-        } else {
-          aElement.target = "_parent";
-        }
-      });
 
-      const formElements =
+    let max = Math.max(r, g, b);
-        iframeRefContents.contentWindow.document.querySelectorAll("form");
+    let min = Math.min(r, g, b);
-      formElements.forEach((formElement) => {
+    let h,
-        const currentHashURL =
+      s,
-          document.location.origin + document.location.pathname + "#";
+      l = (max + min) / 2;
-        if (
+
-          !formElement.action ||
+    if (max === min) {
-          formElement.action.slice(0, 1) == "#" ||
+      h = s = 0; // achromatic
-          formElement.action.slice(0, currentHashURL.length) == currentHashURL
+    } else {
-        ) {
+      let d = max - min;
-          // Prevent form submitting
+      s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
-          formElement.addEventListener("submit", (e) => {
+      switch (max) {
-            e.preventDefault();
+        case r:
-          });
+          h = (g - b) / d + (g < b ? 6 : 0);
-          formElement.target = "_self";
+          break;
-        } else {
+        case g:
-          formElement.target = "_parent";
+          h = (b - r) / d + 2;
-        }
+          break;
-      });
+        case b:
-    };
+          h = (r - g) / d + 4;
+          break;
+      }
+      h /= 6;
+    }
+
+    // Flip lightness
+    l = 1 - l;
+
+    // Convert HSL back to RGB
+    if (s === 0) {
+      r = g = b = l; // achromatic
+    } else {
+      let hue2rgb = function hue2rgb(p, q, t) {
+        if (t < 0) t += 1;
+        if (t > 1) t -= 1;
+        if (t < 1 / 6) return p + (q - p) * 6 * t;
+        if (t < 1 / 2) return q;
+        if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
+        return p;
+      };
+
+      let q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+      let p = 2 * l - q;
+      r = hue2rgb(p, q, h + 1 / 3);
+      g = hue2rgb(p, q, h);
+      b = hue2rgb(p, q, h - 1 / 3);
+    }
+
+    // Return RGB
+    return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
   };
 
-  const resizeOnIframeLoad = useCallback((iframeRefContents, id) => {
-    return () => {
-      const body = iframeRefContents.contentWindow.document.body;
-      const html = iframeRefContents.contentWindow.document.documentElement;
-      const newHeight = Math.max(
-        html.scrollHeight > parseInt(iframeRefContents.height)
-          ? html.scrollHeight
-          : 0,
-        body.offsetHeight,
-        html.offsetHeight
-      );
-      setIframeHeights((iframeHeightsO) => {
-        const newIframeHeights = { ...iframeHeightsO };
-        newIframeHeights[id] = newHeight;
-        return newIframeHeights;
-      });
-    };
-  }, []);
-
   const getMessageIds = () => {
     return messagesToRender
       .slice()
@@ -194,20 +170,6 @@ function MessageContent() {
       .map((message) => message.id);
   };
 
-  useEffect(() => {
-    const resizeOnIframeLoadAllRefs = () => {
-      Object.keys(iframeRef.current).forEach((refKey) => {
-        resizeOnIframeLoad(iframeRef.current[refKey], refKey)();
-      });
-    };
-
-    window.addEventListener("resize", resizeOnIframeLoadAllRefs);
-
-    return () => {
-      window.removeEventListener("resize", resizeOnIframeLoadAllRefs);
-    };
-  }, [resizeOnIframeLoad]);
-
   useEffect(() => {
     if (!loading && messageData && messageData.messages.length > 0)
       document.title = `${
@@ -244,7 +206,17 @@ function MessageContent() {
     }
   }, [view, dispatch]);
 
-  if (loading) {
+  useEffect(() => {
+    const loadJuice = async () => {
+      const newJuice = (await import("juice/client")).default;
+      // Set juice to be a function. The function which returns the function is passed into setJuice
+      setJuice(() => newJuice);
+    };
+
+    loadJuice();
+  }, []);
+
+  if (loading || !juice) {
     return <Loading />;
   } else if (error) {
     return (
@@ -762,6 +734,156 @@ function MessageContent() {
               address: "unknown@example.com"
             };
             const firstFromAddress = firstFrom.address || "unknown@example.com";
+            const inlinedBody = juice(body);
+            const sanitizedBody = DOMPurify.sanitize(inlinedBody, {
+              WHOLE_DOCUMENT: true,
+              FORBID_TAGS: ["style"],
+              FORBID_ATTR: ["class"]
+            });
+            const parsedDocument = new DOMParser().parseFromString(
+              sanitizedBody,
+              "text/html"
+            );
+            const aElements = parsedDocument.querySelectorAll("a");
+            aElements.forEach((aElement) => {
+              const currentHashURL =
+                document.location.origin + document.location.pathname + "#";
+              if (
+                !aElement.href ||
+                aElement.href.slice(0, 1) == "#" ||
+                aElement.href.slice(0, currentHashURL.length) == currentHashURL
+              ) {
+                // Prevent changing the URL
+                aElement.addEventListener("click", (e) => {
+                  e.preventDefault();
+                });
+                aElement.target = "_self";
+              } else {
+                aElement.target = "_parent";
+              }
+            });
+
+            const formElements = parsedDocument.querySelectorAll("form");
+            formElements.forEach((formElement) => {
+              const currentHashURL =
+                document.location.origin + document.location.pathname + "#";
+              if (
+                !formElement.action ||
+                formElement.action.slice(0, 1) == "#" ||
+                formElement.action.slice(0, currentHashURL.length) ==
+                  currentHashURL
+              ) {
+                // Prevent form submitting
+                formElement.addEventListener("submit", (e) => {
+                  e.preventDefault();
+                });
+                formElement.target = "_self";
+              } else {
+                formElement.target = "_parent";
+              }
+            });
+
+            const srcElements = parsedDocument.querySelectorAll("[src]");
+            srcElements.forEach((srcElement) => {
+              if (srcElement.src) {
+                const cidMatch = srcElement.src.match(/^cid:(.+)/);
+                if (cidMatch) {
+                  const cid = cidMatch[1];
+                  const attachment = attachments.find((attachment) => {
+                    return attachment.contentId == cid;
+                  });
+                  if (attachment) {
+                    srcElement.src = `/api/receive/attachment/${attachment.id}`;
+                  }
+                }
+              }
+            });
+
+            const allBodyElements = parsedDocument.querySelectorAll("body *");
+            allBodyElements.forEach((element) => {
+              if (element.getAttribute("color") && !element.style.color) {
+                element.style.color = element.getAttribute("color");
+                element.removeAttribute("color");
+              }
+
+              if (
+                element.getAttribute("bgcolor") &&
+                !element.style.backgroundColor
+              ) {
+                element.style.backgroundColor = element.getAttribute("bgcolor");
+                element.removeAttribute("bgcolor");
+              }
+
+              if (
+                (element.tagName == "TABLE" ||
+                  element.tagName == "TBODY" ||
+                  element.tagName == "TR" ||
+                  element.tagName == "TH" ||
+                  element.tagName == "TD") &&
+                element.getAttribute("width") &&
+                !element.style.width
+              ) {
+                element.style.width = element.getAttribute("width");
+                element.removeAttribute("width");
+              }
+
+              if (
+                (element.tagName == "TABLE" ||
+                  element.tagName == "TBODY" ||
+                  element.tagName == "TR" ||
+                  element.tagName == "TH" ||
+                  element.tagName == "TD") &&
+                element.getAttribute("height") &&
+                !element.style.height
+              ) {
+                element.style.height = element.getAttribute("height");
+                element.removeAttribute("height");
+              }
+
+              const computedStyle = window.getComputedStyle(element);
+              if (
+                element.style.font ||
+                element.style.color ||
+                element.getAttribute("color")
+              ) {
+                const parsedColorMatch = computedStyle.color.match(
+                  /rgba?\((\d{1,3}), (\d{1,3}), (\d{1,3})(?:, (\d{1,3}))?\)/
+                );
+                if (parsedColorMatch) {
+                  const r = parseInt(parsedColorMatch[1]);
+                  const g = parseInt(parsedColorMatch[2]);
+                  const b = parseInt(parsedColorMatch[3]);
+                  if (
+                    isLightOrDark([r, g, b]) == (isDarkMode ? "dark" : "light")
+                  ) {
+                    const newColors = flipLightness([r, g, b]);
+                    element.style.color = `rgba(${newColors[0]}, ${newColors[1]}, ${newColors[2]}, ${parsedColorMatch[4] ? parsedColorMatch[4] : 255})`;
+                  }
+                }
+              }
+              if (
+                element.style.background ||
+                element.style.backgroundColor ||
+                element.getAttribute("bgcolor")
+              ) {
+                const parsedColorMatch = computedStyle.backgroundColor.match(
+                  /rgba?\((\d{1,3}), (\d{1,3}), (\d{1,3})(?:, (\d{1,3}))?\)/
+                );
+                if (parsedColorMatch) {
+                  const r = parseInt(parsedColorMatch[1]);
+                  const g = parseInt(parsedColorMatch[2]);
+                  const b = parseInt(parsedColorMatch[3]);
+                  if (
+                    isLightOrDark([r, g, b]) == (isDarkMode ? "light" : "dark")
+                  ) {
+                    const newColors = flipLightness([r, g, b]);
+                    element.style.backgroundColor = `rgba(${newColors[0]}, ${newColors[1]}, ${newColors[2]}, ${parsedColorMatch[4] ? parsedColorMatch[4] : 255})`;
+                  }
+                }
+              }
+            });
+
+            const emailBody = parsedDocument.body.innerHTML;
 
             return (
               <div className="border-b-2 border-border" key={id}>
@@ -918,28 +1040,9 @@ function MessageContent() {
                     </li>
                   </ul>
                 </div>
-                <Iframe
+                <div
-                  ref={(el) => (iframeRef.current[id] = el)}
+                  className="prose prose-email w-full max-w-full rounded-lg mb-2"
-                  onLoad={() => {
+                  dangerouslySetInnerHTML={{ __html: emailBody }}
-                    setTimeout(() => {
-                      replaceCIDsOnIframeLoad(
-                        iframeRef.current[id],
-                        id,
-                        attachments
-                      )();
-                      processLinksAndFormsOnIframeLoad(iframeRef.current[id])();
-                      resizeOnIframeLoad(iframeRef.current[id], id)();
-                    }, 0);
-                  }}
-                  className="bg-white w-full rounded-lg mb-2 overflow-x-auto overflow-y-hidden"
-                  srcDoc={DOMPurify.sanitize(body, {
-                    WHOLE_DOCUMENT: true
-                  })}
-                  height={
-                    typeof iframeHeights[id] == "undefined"
-                      ? 500
-                      : iframeHeights[id]
-                  }
                 />
                 {realAttachments && realAttachments.length > 0 ? (
                   <>

frontend/tailwind.config.js

@@ -1,3 +1,5 @@
+import typography from "@tailwindcss/typography";
+
 /** @type {import('tailwindcss').Config} */
 export default {
   darkMode: ["class"],
@@ -60,9 +62,61 @@ export default {
       animation: {
         "accordion-down": "accordion-down 0.2s ease-out",
         "accordion-up": "accordion-up 0.2s ease-out",
+      },
+      typography: {
+        DEFAULT: {
+          css: {
+            color: "hsla(var(--foreground), 1)",
+            a: {
+              color: "hsla(var(--primary), 1)"
+            },
+            strong: {
+              color: "hsla(var(--foreground), 1)"
+            },
+            b: {
+              color: "hsla(var(--foreground), 1)"
+            },
+            blockquote: {
+              color: "hsla(var(--foreground), 1)"
+            },
+            table: {
+              textAlign: null
+            },
+            tbody: {
+              textAlign: null
+            },
+            tr: {
+              textAlign: null
+            },
+            th: {
+              textAlign: null
+            },
+            td: {
+              textAlign: null
+            },
+            "th, td": {
+              textAlign: null
+            }
+          }
+        },
+        email: {
+          css: {
+            code: {
+              "&:before": {
+                content: ""
+              },
+              "&:after": {
+                content: ""
+              },
+            },
+            pre: {
+              backgroundColor: "inherit"
+            },
+          }
+        }
       }
     }
   },
-  plugins: [],
+  plugins: [typography],
 }
 

frontend/vite.config.js

@@ -24,5 +24,8 @@ export default defineConfig({
         changeOrigin: true
       }
     }
+  },
+  build: {
+    chunkSizeWarningLimit: 600
   }
 });