refactor(fallbacks): share template, tighter UX, cleaner JSON

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/assets/js/model/inbound.js

@@ -145,6 +145,19 @@ class XrayCommonClass {
         return this;
     }
 
+    // Build a clean Xray fallback entry. Per docs, name/alpn/path empty = "any",
+    // and xver=0 means PROXY protocol off — omit them so the generated config
+    // stays minimal and readable. dest is required and always emitted.
+    static fallbackToJson(fb) {
+        const out = { dest: fb.dest };
+        if (fb.name) out.name = fb.name;
+        if (fb.alpn) out.alpn = fb.alpn;
+        if (fb.path) out.path = fb.path;
+        const xver = Number(fb.xver);
+        if (Number.isInteger(xver) && xver > 0) out.xver = xver;
+        return out;
+    }
+
     toString(format = true) {
         return format ? JSON.stringify(this.toJson(), null, 2) : JSON.stringify(this.toJson());
     }
@@ -2733,31 +2746,13 @@ Inbound.VLESSSettings.Fallback = class extends XrayCommonClass {
     }
 
     toJson() {
-        let xver = this.xver;
-        if (!Number.isInteger(xver)) {
-            xver = 0;
-        }
-        return {
-            name: this.name,
-            alpn: this.alpn,
-            path: this.path,
-            dest: this.dest,
-            xver: xver,
-        }
+        return XrayCommonClass.fallbackToJson(this);
     }
 
     static fromJson(json = []) {
-        const fallbacks = [];
-        for (let fallback of json) {
-            fallbacks.push(new Inbound.VLESSSettings.Fallback(
-                fallback.name,
-                fallback.alpn,
-                fallback.path,
-                fallback.dest,
-                fallback.xver,
-            ))
-        }
-        return fallbacks;
+        return (json || []).map(f => new Inbound.VLESSSettings.Fallback(
+            f.name, f.alpn, f.path, f.dest, f.xver,
+        ));
     }
 };
 
@@ -2786,10 +2781,13 @@ Inbound.TrojanSettings = class extends Inbound.Settings {
     }
 
     toJson() {
-        return {
+        const json = {
             clients: Inbound.TrojanSettings.toJsonArray(this.trojans),
-            fallbacks: Inbound.TrojanSettings.toJsonArray(this.fallbacks)
         };
+        if (this.fallbacks && this.fallbacks.length > 0) {
+            json.fallbacks = Inbound.TrojanSettings.toJsonArray(this.fallbacks);
+        }
+        return json;
     }
 };
 
@@ -2828,31 +2826,13 @@ Inbound.TrojanSettings.Fallback = class extends XrayCommonClass {
     }
 
     toJson() {
-        let xver = this.xver;
-        if (!Number.isInteger(xver)) {
-            xver = 0;
-        }
-        return {
-            name: this.name,
-            alpn: this.alpn,
-            path: this.path,
-            dest: this.dest,
-            xver: xver,
-        }
+        return XrayCommonClass.fallbackToJson(this);
     }
 
     static fromJson(json = []) {
-        const fallbacks = [];
-        for (let fallback of json) {
-            fallbacks.push(new Inbound.TrojanSettings.Fallback(
-                fallback.name,
-                fallback.alpn,
-                fallback.path,
-                fallback.dest,
-                fallback.xver,
-            ))
-        }
-        return fallbacks;
+        return (json || []).map(f => new Inbound.TrojanSettings.Fallback(
+            f.name, f.alpn, f.path, f.dest, f.xver,
+        ));
     }
 };
 

web/html/form/fallbacks.html

@@ -0,0 +1,85 @@
+{{define "form/fallbacks"}}
+<div :style="{ display: 'flex', alignItems: 'center', flexWrap: 'wrap', gap: '8px', margin: '8px 0' }">
+  <span :style="{ fontWeight: 500 }">
+    <a-tooltip title="Route incoming TLS traffic to a backend when it doesn't match a valid VLESS/Trojan handshake. Match by SNI, ALPN, and HTTP path; the most precise rule wins. Fallbacks require TCP+TLS transport.">
+      Fallbacks ([[ inbound.settings.fallbacks.length ]])
+      <a-icon type="question-circle"></a-icon>
+    </a-tooltip>
+  </span>
+  <span :style="{ flex: 1 }"></span>
+  <a-button icon="plus" type="primary" size="small" @click="inbound.settings.addFallback()">Add</a-button>
+</div>
+
+<a-form v-for="(fallback, index) in inbound.settings.fallbacks" :colon="false"
+  :label-col="{ md: {span:8} }" :wrapper-col="{ md: {span:14} }">
+  <a-divider :style="{ margin: '0' }">
+    Fallback [[ index + 1 ]]
+    <a-icon type="delete" @click="() => inbound.settings.delFallback(index)"
+      :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '6px' }"></a-icon>
+  </a-divider>
+
+  <a-form-item>
+    <template slot="label">
+      <a-tooltip title="Match TLS SNI (server name). Leave empty to match any SNI.">
+        SNI <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-input v-model.trim="fallback.name" placeholder="any (leave empty)"></a-input>
+  </a-form-item>
+
+  <a-form-item>
+    <template slot="label">
+      <a-tooltip title="Match TLS ALPN. 'any' = no ALPN constraint. Use h2/http/1.1 split when the inbound advertises both.">
+        ALPN <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-select v-model="fallback.alpn" :style="{ width: '100%' }">
+      <a-select-option value="">any</a-select-option>
+      <a-select-option value="h2">h2</a-select-option>
+      <a-select-option value="http/1.1">http/1.1</a-select-option>
+    </a-select>
+  </a-form-item>
+
+  <a-form-item
+    :validate-status="fallback.path && !fallback.path.startsWith('/') ? 'error' : ''"
+    :help="fallback.path && !fallback.path.startsWith('/') ? 'Path must start with /' : ''">
+    <template slot="label">
+      <a-tooltip title="Match the HTTP request path of the first packet. Must start with '/'. Leave empty to match any.">
+        Path <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-input v-model.trim="fallback.path" placeholder="any (leave empty) or /ws"></a-input>
+  </a-form-item>
+
+  <a-form-item
+    :validate-status="!fallback.dest ? 'error' : ''"
+    :help="!fallback.dest ? 'Destination is required' : ''">
+    <template slot="label">
+      <a-tooltip>
+        <template slot="title">
+          <span>
+            Where matching traffic is forwarded. Accepts a port number (<code>80</code>),
+            an <code>addr:port</code> (<code>127.0.0.1:8080</code>), or a Unix socket path
+            (<code>/dev/shm/x.sock</code> or <code>@abstract</code>).
+          </span>
+        </template>
+        Destination <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-input v-model.trim="fallback.dest" placeholder="80 | 127.0.0.1:8080 | /dev/shm/x.sock"></a-input>
+  </a-form-item>
+
+  <a-form-item>
+    <template slot="label">
+      <a-tooltip title="PROXY protocol version sent to the destination. Off (0) for plain TCP; v1/v2 to preserve client IP if the backend supports it.">
+        PROXY <a-icon type="question-circle"></a-icon>
+      </a-tooltip>
+    </template>
+    <a-select v-model="fallback.xver" :style="{ width: '100%' }">
+      <a-select-option :value="0">Off</a-select-option>
+      <a-select-option :value="1">v1</a-select-option>
+      <a-select-option :value="2">v2</a-select-option>
+    </a-select>
+  </a-form-item>
+</a-form>
+{{end}}

web/html/form/protocol/trojan.html

@@ -19,35 +19,7 @@
   </a-collapse-panel>
 </a-collapse>
 <template v-if=" inbound.isTcp">
-  <a-form :colon="false" :label-col="{ md: {span:8} }" :wrapper-col="{ md: {span:14} }">
-    <a-form-item label="Fallbacks">
-      <a-button icon="plus" type="primary" size="small" @click="inbound.settings.addFallback()"></a-button>
-    </a-form-item>
-  </a-form>
-
-  <!-- trojan fallbacks -->
-  <a-form v-for="(fallback, index) in inbound.settings.fallbacks" :colon="false" :label-col="{ md: {span:8} }"
-    :wrapper-col="{ md: {span:14} }">
-    <a-divider :style="{ margin: '0' }"> Fallback [[ index + 1 ]] <a-icon type="delete"
-        @click="() => inbound.settings.delFallback(index)"
-        :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer' }"></a-icon>
-    </a-divider>
-    <a-form-item label='SNI'>
-      <a-input v-model="fallback.name"></a-input>
-    </a-form-item>
-    <a-form-item label='ALPN'>
-      <a-input v-model="fallback.alpn"></a-input>
-    </a-form-item>
-    <a-form-item label='Path'>
-      <a-input v-model="fallback.path"></a-input>
-    </a-form-item>
-    <a-form-item label='Dest'>
-      <a-input v-model="fallback.dest"></a-input>
-    </a-form-item>
-    <a-form-item label='xVer'>
-      <a-input-number v-model.number="fallback.xver" :min="0" :max="2"></a-input-number>
-    </a-form-item>
-  </a-form>
+  {{template "form/fallbacks" .}}
   <a-divider style="margin:5px 0;"></a-divider>
 </template>
 {{end}}

web/html/form/protocol/vless.html

@@ -42,35 +42,7 @@
   <a-divider :style="{ margin: '5px 0' }"></a-divider>
 </template>
 <template v-if="inbound.isTcp && (!inbound.settings.encryption || inbound.settings.encryption === 'none')">
-  <a-form :colon="false" :label-col="{ md: {span:8} }" :wrapper-col="{ md: {span:14} }">
-    <a-form-item label="Fallbacks">
-      <a-button icon="plus" type="primary" size="small" @click="inbound.settings.addFallback()"></a-button>
-    </a-form-item>
-  </a-form>
-
-  <!-- vless fallbacks -->
-  <a-form v-for="(fallback, index) in inbound.settings.fallbacks" :colon="false" :label-col="{ md: {span:8} }"
-    :wrapper-col="{ md: {span:14} }">
-    <a-divider :style="{ margin: '0' }"> Fallback [[ index + 1 ]] <a-icon type="delete"
-        @click="() => inbound.settings.delFallback(index)"
-        :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer' }"></a-icon>
-    </a-divider>
-    <a-form-item label='SNI'>
-      <a-input v-model="fallback.name"></a-input>
-    </a-form-item>
-    <a-form-item label='ALPN'>
-      <a-input v-model="fallback.alpn"></a-input>
-    </a-form-item>
-    <a-form-item label='Path'>
-      <a-input v-model="fallback.path"></a-input>
-    </a-form-item>
-    <a-form-item label='Dest'>
-      <a-input v-model="fallback.dest"></a-input>
-    </a-form-item>
-    <a-form-item label='xVer'>
-      <a-input-number v-model.number="fallback.xver" :min="0" :max="2"></a-input-number>
-    </a-form-item>
-  </a-form>
+  {{template "form/fallbacks" .}}
   <a-divider :style="{ margin: '5px 0' }"></a-divider>
 </template>
 <template v-if="inbound.canEnableVisionSeed()">