feat: Enable HTTP inspection even for absolute links

README.md

@@ -67,7 +67,8 @@ The default options are:
       "userAgent": "textlint-rule-no-dead-link/1.0",
       "maxRetryTime": 10,
       "maxRetryAfterTime": 90,
-      "linkMaxAge": 30000
+      "linkMaxAge": 30000,
+      "httpOnly": false
     }
   }
 }
@@ -183,6 +184,12 @@ The time (in milliseconds) that the cache for the result indicating whether a li
 
 Default: `30000`
 
+### httpOnly
+
+Controls whether all links are treated as HTTP/HTTPS links. If `true`, links like `/path/to` are checked for existence via HTTP/HTTPS communication rather than the filesystem. The Base URI is the base of the redirect source URL for redirects, and `baseURI` otherwise.
+
+Default: `false`
+
 ## CI Integration
 
 Probably, Link Checking take long times.

src/no-dead-link.ts

@@ -23,6 +23,7 @@ export type Options = {
     maxRetryTime: number; // (number) The max of waiting seconds for retry. It is related to `retry` option. It does affect to `Retry-After` header.
     maxRetryAfterTime: number; // (number) The max of waiting seconds for `Retry-After` header.
     linkMaxAge: number; // (number) The max age in milliseconds for caching link check results.
+    httpOnly: boolean; // (boolean) `true` treats all links as http/https links
 };
 const DEFAULT_OPTIONS: Options = {
     checkRelative: true, // {boolean} `false` disables the checks for relative URIs.
@@ -38,7 +39,8 @@ const DEFAULT_OPTIONS: Options = {
     userAgent: "textlint-rule-no-dead-link/1.0", // {String} a UserAgent,
     maxRetryTime: 10, // (number) The max of waiting seconds for retry. It is related to `retry` option. It does affect to `Retry-After` header.
     maxRetryAfterTime: 10, // (number) The max of waiting seconds for `Retry-After` header.
-    linkMaxAge: 30 * 1000 // (number) The max age in milliseconds for caching link check results.
+    linkMaxAge: 30 * 1000, // (number) The max age in milliseconds for caching link check results.
+    httpOnly: false // (boolean) `true` treats all links as http/https links
 };
 
 // Adopted from http://stackoverflow.com/a/3809435/951517
@@ -149,9 +151,10 @@ type AliveFunctionReturn = {
 /**
  * Create isAliveURI function with ruleOptions
  * @param {object} ruleOptions
+ * @param {function} resolvePath
  * @returns {isAliveURI}
  */
-const createCheckAliveURL = (ruleOptions: Options) => {
+const createCheckAliveURL = (ruleOptions: Options, resolvePath: (path: string, base: string) => string | undefined) => {
     // Create fetch function for this rule
     const fetchWithDefaults = createFetchWithRuleDefaults(ruleOptions);
     /**
@@ -196,9 +199,10 @@ const createCheckAliveURL = (ruleOptions: Options) => {
                     };
                 }
 
-                const redirectedUrl = isRelative(location)
-                    ? URL.parse(location, URL.parse(uri)?.origin)?.href
-                    : location;
+                // Since fetch is successful, parsing always succeeds
+                const base = URL.parse(uri)!.origin;
+
+                const redirectedUrl = resolvePath(location, base);
                 if (!redirectedUrl) {
                     return {
                         ok: false,
@@ -290,7 +294,21 @@ const reporter: TextlintRuleReporter<Options> = (context, options) => {
     const { Syntax, getSource, report, RuleError, fixer, getFilePath, locator } = context;
     const helper = new RuleHelper(context);
     const ruleOptions = { ...DEFAULT_OPTIONS, ...options };
-    const isAliveURI = createCheckAliveURL(ruleOptions);
+    const resolvePath = (path: string, base: string): string | undefined => {
+        if (ruleOptions.httpOnly) {
+            return URL.parse(path, base)?.href;
+        } else {
+            if (isRelative(path)) {
+                // eslint-disable-next-line no-param-reassign
+                // Convert file path to file:// URL if needed
+                const baseURL = base.startsWith("http") || base.startsWith("file://") ? base : `file://${base}`;
+                return URL.parse(path, baseURL)?.href;
+            } else {
+                return path;
+            }
+        }
+    };
+    const isAliveURI = createCheckAliveURL(ruleOptions, resolvePath);
     const memorizedIsAliveURI = pMemoize(isAliveURI, {
         maxAge: ruleOptions.linkMaxAge
     });
@@ -306,29 +324,17 @@ const reporter: TextlintRuleReporter<Options> = (context, options) => {
             return;
         }
 
-        if (isRelative(uri)) {
-            if (!ruleOptions.checkRelative) {
-                return;
-            }
-
-            const filePath = getFilePath();
-            const base = ruleOptions.baseURI || filePath;
-            if (!base) {
-                const message =
-                    "Unable to resolve the relative URI. Please check if the base URI is correctly specified.";
-
-                report(node, new RuleError(message, { padding: locator.range([index, index + uri.length]) }));
-                return;
-            }
+        if (isRelative(uri) && !ruleOptions.checkRelative) {
+            return;
+        }
+        const base = ruleOptions.baseURI || getFilePath();
+        if (isRelative(uri) && !base) {
+            const message = "Unable to resolve the relative URI. Please check if the base URI is correctly specified.";
 
-            // eslint-disable-next-line no-param-reassign
-            // Convert file path to file:// URL if needed
-            const baseURL = base.startsWith("http") || base.startsWith("file://") ? base : `file://${base}`;
-            const resolved = URL.parse(uri, baseURL);
-            if (resolved) {
-                uri = resolved.href;
-            }
+            report(node, new RuleError(message, { padding: locator.range([index, index + uri.length]) }));
+            return;
         }
+        uri = resolvePath(uri, base || "") || uri;
 
         // Ignore non http external link
         // https://github.com/textlint-rule/textlint-rule-no-dead-link/issues/112

test/no-dead-link.ts

@@ -135,6 +135,14 @@ tester.run("no-dead-link", rule, {
                 userAgent:
                     "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36"
             }
+        },
+        // Test whether an absolute path can be resolved for `httpOnly` option
+        {
+            text: "should be able to check absolute path when httpOnly is true: [example](/200)",
+            options: {
+                httpOnly: true,
+                baseURI: TEST_SERVER_URL
+            }
         }
         // https://github.com/textlint-rule/textlint-rule-no-dead-link/issues/125
         // SKIP: External service test (consul.io redirects too many times)
@@ -278,6 +286,21 @@ tester.run("no-dead-link", rule, {
                     }
                 }
             ]
+        },
+        // If not `httpOnly`, test whether the absolute path can be resolved
+        {
+            text: "should be able to check absolute path when httpOnly is false: [example](/200)",
+            options: {
+                httpOnly: false,
+                baseURI: TEST_SERVER_URL
+            },
+            errors: [
+                {
+                    message: `/200 is dead. (ENOENT: no such file or directory, access '${process.platform === "win32" ? "D:\\" : "/"}200')`,
+                    line: 1,
+                    column: 73
+                }
+            ]
         }
     ]
 });