feat(inference): add llmisvc_model_provider_resolver

docs/filters/llmisvc_model_provider_resolver.md

@@ -0,0 +1,28 @@
+<!-- Generated by: cargo xtask generate-filter-docs -->
+<!-- Do not edit manually -->
+
+# `llmisvc_model_provider_resolver`
+
+Ports the `LLMISvc` / `KServe` BBR body-rewrite branch from IPP's `model-provider-resolver`.
+
+## Configuration Notes
+
+Reads the model name from the configured request header (default `X-Model`, typically set by an earlier `model_to_header`). When that value is a publisher ID (`publishers/.../models/<name>`), rewrite the body `"model"` field to `<name>` only. The routing header is never modified -- `KServe` routes on the publisher ID.
+
+If the header is absent/empty, or the body has no `"model"` field, this filter is a no-op (it does not invent a body `"model"`).
+
+Does **not** resolve `ExternalModel` / `ExternalProvider` CRDs, perform weighted provider selection, rewrite `Host`, or inject credentials.
+
+## Configuration
+
+| Field | Type | Required | Description |
+|-------|------|---------|-------------|
+| `header` | string | no | Request header that carries the publisher ID for `KServe` routing. Defaults to `X-Model` (same as `model_to_header`). |
+| `max_body_bytes` | integer | no | Maximum request body size to buffer before parsing. |
+
+## Example
+
+```yaml
+filter: llmisvc_model_provider_resolver
+header: X-Model   # optional, defaults to X-Model
+```

docs/filters/reference.md

@@ -64,6 +64,7 @@ see the [Praxis core filter reference][core-ref].
 
 | Filter | Description |
 |--------|-------------|
+| [`llmisvc_model_provider_resolver`](llmisvc_model_provider_resolver.md) | Ports the `LLMISvc` / `KServe` BBR body-rewrite branch from IPP's `model-provider-resolver`. |
 | [`model_to_header`](model_to_header.md) | Promotes the JSON `"model"` field from the request body to a request header. |
 
 ### Prompt Enrich

examples/README.md

@@ -29,6 +29,7 @@ before sending requests.
 | [intelligent-route-mcp.yaml](configs/intelligent-route-mcp.yaml) | Routes MCP `tools/call` requests to the cluster that owns the requested tool, using the `mcp.name` metadata set by the `mcp` filter |
 | [intelligent-route-overlay.yaml](configs/intelligent-route-overlay.yaml) | Routes requests using a routing overlay file (`routing-overlay.json`) instead of inline YAML candidates |
 | [json-rpc-routing.yaml](configs/json-rpc-routing.yaml) | Routes JSON-RPC 2.0 requests to different backends based on the "method" field in the JSON request body |
+| [llmisvc-model-provider-resolver.yaml](configs/llmisvc-model-provider-resolver.yaml) | Ports the LLMISvc / KServe BBR body-rewrite path: when the model name is a publisher ID (`publishers/{ns}/models/{name}`), rewrite the JSON body `"model"` field to `{name}` so vLLM receives the short name |
 | [mcp-classifier-routing.yaml](configs/mcp-classifier-routing.yaml) | Routes MCP requests by body-derived method and tool name |
 | [mcp-stateless-broker.yaml](configs/mcp-stateless-broker.yaml) | Configurable stateless MCP broker using the final MCP 2026-07-28 stateless profile |
 | [model-to-header-routing.yaml](configs/model-to-header-routing.yaml) | Routes LLM API requests to different backends based on the "model" field in the JSON request body |

examples/configs/llmisvc-model-provider-resolver.yaml

@@ -0,0 +1,46 @@
+# LLMISvc Model Provider Resolver
+#
+# Build:
+#   cargo build -p praxis-ai-proxy
+#
+# Ports the LLMISvc / KServe BBR body-rewrite path: when the model
+# name is a publisher ID (`publishers/{ns}/models/{name}`), rewrite
+# the JSON body `"model"` field to `{name}` so vLLM receives the
+# short name. The routing header (default `X-Model`) is left
+# unchanged so KServe can still route on the publisher ID.
+#
+# Typical chain: `model_to_header` promotes the body model to
+# `X-Model`, then `llmisvc_model_provider_resolver` strips the
+# publisher prefix from the body only.
+#
+# Example request:
+#
+#   curl -X POST http://localhost:8080/v1/chat/completions \
+#     -H "Content-Type: application/json" \
+#     -d '{"model":"publishers/rhoai/models/granite-3.1-8b","messages":[{"role":"user","content":"hi"}]}'
+#
+# Upstream body model becomes `granite-3.1-8b` while `X-Model`
+# remains `publishers/rhoai/models/granite-3.1-8b`.
+
+listeners:
+  - name: llmisvc-gateway
+    address: "0.0.0.0:8080" # dev value; binds all interfaces
+    filter_chains:
+      - rewrite-and-route
+
+filter_chains:
+  - name: rewrite-and-route
+    filters:
+      - filter: model_to_header
+        header: X-Model
+      - filter: llmisvc_model_provider_resolver
+        header: X-Model
+      - filter: router
+        routes:
+          - path_prefix: "/"
+            cluster: provider
+      - filter: load_balancer
+        clusters:
+          - name: provider
+            endpoints:
+              - "127.0.0.1:3000"