Messages To Anthropic

# Vertex AI dialect translation (Anthropic Messages -> rawPredict)
#
# Translates Anthropic Messages requests into Vertex AI rawPredict form
# and Vertex responses back to the Anthropic dialect after model_to_provider
# selects an upstream and resolves its exact target model.
#
# Public aliases (public-claude and public-claude-snapshot) map to the
# documented Vertex snapshot in model_to_provider. The load balancer
# publishes application_provider: vertex for the adapter; unmapped models
# go to the fallback backend.
# The body model moves into the URL path (:rawPredict /
# :streamRawPredict), anthropic_version is injected, and responses are
# translated back (user-facing model id restored, Google error
# envelopes mapped to Anthropic error types).
#
# Production note: replace the static credential_injection below with
# the experimental `gcp_adc` filter (source: metadata) on a Google Cloud
# host to fetch short-lived OAuth tokens from its attached service account,
# and point the cluster at
# aiplatform.googleapis.com:443 with tls.sni likewise.
#
# This example is fully self-contained and proxies to a local backend
# so it can be exercised without GCP credentials.
#
# Experimental: rebuild with --features vertex-anthropic-filter.
# Configuration may change before graduation.
#
# Usage:
#   cargo run -p praxis-ai-proxy --features vertex-anthropic-filter -- \
#     -c examples/configs/vertex/messages-to-anthropic.yaml

listeners:
  - name: gateway
    address: "0.0.0.0:8080"
    filter_chains:
      - vertex

filter_chains:
  - name: vertex
    filters:
      - filter: model_to_provider
        fallback_upstream: fallback
        max_body_bytes: 33554432 # matches the Vertex adapter's 32 MiB limit
        models:
          - model: public-claude
            upstream: vertex
            target_model: claude-sonnet-4-5@20250929
            paths: [/v1/messages, /v1/messages/count_tokens]
          - model: public-claude-snapshot
            upstream: vertex
            target_model: claude-sonnet-4-5@20250929
            paths: [/v1/messages, /v1/messages/count_tokens]
      - filter: anthropic_messages_to_vertexai_anthropic
        project: my-gcp-project
        # location: global          # default; use a regional location for data residency
        # beta_allowlist: [context-1m-2025-08-07]
      - filter: credential_injection
        clusters:
          - name: vertex
            header: Authorization
            header_prefix: "Bearer "
            value: "ya29.example-static-token"
            strip_client_credential: true
      - filter: load_balancer
        clusters:
          - name: vertex
            http:
              application_provider: vertex
            endpoints:
              - "127.0.0.1:3000"
          - name: fallback
            endpoints:
              - "127.0.0.1:3001"

insecure_options:
  allow_private_endpoints: true # example proxies to a local backend