add model-mapper plugin & optimize model-router plugin

plugins/wasm-cpp/extensions/model_mapper/BUILD

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+# Copyright (c) 2022 Alibaba Group Holding Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@proxy_wasm_cpp_sdk//bazel:defs.bzl", "proxy_wasm_cc_binary")
+load("//bazel:wasm.bzl", "declare_wasm_image_targets")
+
+proxy_wasm_cc_binary(
+    name = "model_mapper.wasm",
+    srcs = [
+        "plugin.cc",
+        "plugin.h",
+    ],
+    deps = [
+        "@proxy_wasm_cpp_sdk//:proxy_wasm_intrinsics_higress",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/time",
+        "//common:json_util",
+        "//common:http_util",
+        "//common:rule_util",
+    ],
+)
+
+cc_library(
+    name = "model_mapper_lib",
+    srcs = [
+        "plugin.cc",
+    ],
+    hdrs = [
+        "plugin.h",
+    ],
+    copts = ["-DNULL_PLUGIN"],
+    deps = [
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/time",
+        "//common:json_util",
+        "@proxy_wasm_cpp_host//:lib",
+        "//common:http_util_nullvm",
+        "//common:rule_util_nullvm",
+    ],
+)
+
+cc_test(
+    name = "model_mapper_test",
+    srcs = [
+        "plugin_test.cc",
+    ],
+    copts = ["-DNULL_PLUGIN"],
+    deps = [
+        ":model_mapper_lib",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+        "@proxy_wasm_cpp_host//:lib",
+    ],
+)
+
+declare_wasm_image_targets(
+    name = "model_mapper",
+    wasm_file = ":model_mapper.wasm",
+)

plugins/wasm-cpp/extensions/model_mapper/README.md

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+## 功能说明
+`model-mapper`插件实现了基于LLM协议中的model参数路由的功能
+
+## 配置字段
+
+| 名称                 | 数据类型        | 填写要求                | 默认值                   | 描述                                                                                                                                                                                                                                                         |
+| -----------          | --------------- | ----------------------- | ------                   | -------------------------------------------                                                                                                                                                                                                                  |
+| `modelKey`           | string          | 选填                    | model                    | 请求body中model参数的位置                                                                                                                                                                                                                                    |
+| `modelMapping`       | map of string   | 选填                    | -                        | AI 模型映射表，用于将请求中的模型名称映射为服务提供商支持模型名称。<br/>1. 支持前缀匹配。例如用 "gpt-3-*" 匹配所有名称以“gpt-3-”开头的模型；<br/>2. 支持使用 "*" 为键来配置通用兜底映射关系；<br/>3. 如果映射的目标名称为空字符串 ""，则表示保留原模型名称。 |
+| `enableOnPathSuffix` | array of string | 选填                    | ["/v1/chat/completions"] | 只对这些特定路径后缀的请求生效                                                                                                                              ## 运行属性
+
+插件执行阶段：认证阶段
+插件执行优先级：800
+                                                                                                 |
+## 效果说明
+
+如下配置
+
+```yaml
+modelMapping:
+  'gpt-4-*': "qwen-max"
+  'gpt-4o': "qwen-vl-plus"
+  '*': "qwen-turbo"
+```
+
+开启后，`gpt-4-` 开头的模型参数会被改写为 `qwen-max`, `gpt-4o` 会被改写为 `qwen-vl-plus`，其他所有模型会被改写为 `qwen-turbo`
+
+例如原本的请求是：
+
+```json
+{
+    "model": "gpt-4o",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "higress项目主仓库的github地址是什么"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```
+
+
+经过这个插件后，原始的 LLM 请求体将被改成：
+
+```json
+{
+    "model": "qwen-vl-plus",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "higress项目主仓库的github地址是什么"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```

plugins/wasm-cpp/extensions/model_mapper/README_EN.md

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+## Function Description
+The `model-mapper` plugin implements the functionality of routing based on the model parameter in the LLM protocol.
+
+## Configuration Fields
+
+| Name                 | Data Type        | Filling Requirement                | Default Value                   | Description                                                                                                                                                                                                                                                         |
+| -----------          | --------------- | -----------------------            | ------                          | -------------------------------------------                                                                                                                                                                                                                  |
+| `modelKey`           | string          | Optional                           | model                           | The location of the model parameter in the request body.                                                                                                                                                                                                            |
+| `modelMapping`       | map of string   | Optional                           | -                               | AI model mapping table, used to map the model names in the request to the model names supported by the service provider.<br/>1. Supports prefix matching. For example, use "gpt-3-*" to match all models whose names start with “gpt-3-”;<br/>2. Supports using "*" as the key to configure a generic fallback mapping relationship;<br/>3. If the target name in the mapping is an empty string "", it means to keep the original model name. |
+| `enableOnPathSuffix` | array of string | Optional                           | ["/v1/chat/completions"]        | Only applies to requests with these specific path suffixes.                                                                                                                                           |
+
+## Runtime Properties
+
+Plugin execution phase: Authentication phase
+Plugin execution priority: 800
+
+## Effect Description
+
+With the following configuration:
+
+```yaml
+modelMapping:
+  'gpt-4-*': "qwen-max"
+  'gpt-4o': "qwen-vl-plus"
+  '*': "qwen-turbo"
+```
+
+After enabling, model parameters starting with `gpt-4-` will be rewritten to `qwen-max`, `gpt-4o` will be rewritten to `qwen-vl-plus`, and all other models will be rewritten to `qwen-turbo`.
+
+For example, if the original request was:
+
+```json
+{
+    "model": "gpt-4o",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "What is the GitHub address of the main repository for the higress project?"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```
+
+
+After processing by this plugin, the original LLM request body will be modified to:
+
+```json
+{
+    "model": "qwen-vl-plus",
+    "frequency_penalty": 0,
+    "max_tokens": 800,
+    "stream": false,
+    "messages": [{
+        "role": "user",
+        "content": "What is the GitHub address of the main repository for the higress project?"
+    }],
+    "presence_penalty": 0,
+    "temperature": 0.7,
+    "top_p": 0.95
+}
+```