feat: crack Slader limit

.gitignore

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+# VSCode related files
+.vscode/
+
+# MacOS related files
+**/.DS_Store

README.md

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-# slader-crack
+# slader-crack
+
+The repo aims to crack Slader's 5 solutions limit.
+
+## Tutorial
+
+1. Go to [Release page](https://github.com/FawenYo/slader-crack/releases) and download the latest release.
+2. Extract the zip file.
+3. Go to [Chrome Extension page](chrome://extensions/) and switch on the developmer mode at the top-right.
+4. Click "Load unpacked" at the top-left and choose the extracted folder.
+5. All things done! Just go surfing on the Slader :+1:
+
+## Technical Detail
+
+### Explain
+
+* scripts/crack.js: Bypass Slader limit by replace X-Forwarded-For value in onBeforeSendHeaders status.
+![ChromeWebRequest](https://i.imgur.com/GSIynKj.png)
+* scripts/footer.js: Remove payment info footer on the page.

slader-crack/manifest.json

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+{
+    "name": "SladerCrack",
+    "version": "0.1",
+    "author": "FawenYo",
+    "description": "crack slader limit",
+    "permissions": [
+        "webRequest",
+        "webRequestBlocking",
+        "*://*.slader.com/*"
+    ],
+    "background": {
+        "scripts": [
+            "scripts/crack.js"
+        ],
+        "persistent": true
+    },
+    "content_scripts": [{
+        "matches": ["*://*.slader.com/textbook/*"],
+        "js": ["scripts/footer.js"]
+    }],
+    "icons": {
+        "16": "images/icon16.png",
+        "48": "images/icon48.png",
+        "128": "images/icon128.png"
+    },
+    "manifest_version": 2
+}

slader-crack/scripts/crack.js

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+chrome.webRequest.onBeforeSendHeaders.addListener(
+    function (details) {
+        var new_x_forwarded = Math.floor(Math.random() * 100000000).toString()
+        var got_x_forwarded = false
+        for (var request_headers_name in details.requestHeaders) {
+            // Find X-Forwarded-For
+            got_x_forwarded = details.requestHeaders[request_headers_name].name.toLowerCase() == "x-forwarded-for"
+            if (got_x_forwarded) {
+                // Replace wih new value
+                details.requestHeaders[request_headers_name].value = new_x_forwarded
+                break
+            }
+        }
+        if (!got_x_forwarded) {
+            details.requestHeaders.push({ name: "X-Forwarded-For", value: new_x_forwarded })
+        }
+        return { requestHeaders: details.requestHeaders }
+    },
+    {
+        urls: ["*://*.slader.com/*"],
+    },
+    ["blocking", "requestHeaders"]
+)
+
+chrome.webRequest.onSendHeaders.addListener(
+    function (details) {
+        return { requestHeaders: details.requestHeaders }
+    },
+    { urls: ["*://*.slader.com/textbook/*"] },
+    ["requestHeaders"]
+)

slader-crack/scripts/footer.js

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+var element_removed = false
+var element_parent = document.body
+
+var observer = new MutationObserver(function (mutations) {
+    mutations.forEach(function (mutation) {
+        if (mutation.addedNodes && mutation.addedNodes.length > 0) {
+            var node1 = mutation.target.querySelector("section.Paywall__footer-counter")
+            if (node1) {
+                node1.parentNode.removeChild(node1)
+                element_removed = true
+            }
+
+            if (element_removed) {
+                observer.disconnect()
+            }
+        }
+    })
+})
+
+observer.observe(element_parent, {
+    childList: true,
+    subtree: true,
+})