API versioning: /v1

Closes #5

README.md

@@ -35,9 +35,9 @@ hosted at `https://example.com`:
 ```hcl
 terraform {
   backend "http" {
-    address = "https://example.com/state/<path>" 
-    lock_address = "https://example.com/lock/<path>"
-    unlock_address = "https://example.com/lock/<path>"
+    address = "https://example.com/v1/state/<path>" 
+    lock_address = "https://example.com/v1/lock/<path>"
+    unlock_address = "https://example.com/v1/lock/<path>"
     lock_method = "POST"
     unlock_method = "DELETE"
   }

example/main.tf

@@ -7,9 +7,9 @@ terraform {
   }
 
   backend "http" {
-    address = "http://127.0.0.1:8300/state/terraform"
-    lock_address = "http://127.0.0.1:8300/lock/terraform"
-    unlock_address = "http://127.0.0.1:8300/lock/terraform"
+    address = "http://127.0.0.1:8300/v1/state/terraform"
+    lock_address = "http://127.0.0.1:8300/v1/lock/terraform"
+    unlock_address = "http://127.0.0.1:8300/v1/lock/terraform"
     lock_method = "POST"
     unlock_method = "DELETE"
   }

src/__main__.py

@@ -531,14 +531,20 @@ async def read_root_head() -> Response:
     """Support HTTP GET and HEAD for /."""
     return Response()
 
+@app.head("/v1")
+@app.get("/v1")
+async def read_v1_head() -> Response:
+    """Support HTTP GET and HEAD for /."""
+    return Response()
+
 
-@app.get("/state/{secrets_path:path}")
+@app.get("/v1/state/{secrets_path:path}")
 async def get_state(vault: VaultDep, token: TokenDep) -> StateData:
     """Get the Vault state."""
     return vault.get_state(token=token)
 
 
-@app.post("/state/{secrets_path:path}")
+@app.post("/v1/state/{secrets_path:path}")
 async def update_state(request: Request, vault: VaultDep, token: TokenDep) -> None:
     """Update the Vault state."""
     try:
@@ -550,20 +556,20 @@ async def update_state(request: Request, vault: VaultDep, token: TokenDep) -> No
     vault.set_state(token=token, value=data)
 
 
-@app.get("/lock/{secrets_path:path}")
+@app.get("/v1/lock/{secrets_path:path}")
 async def get_lock_info(vault: VaultDep, token: TokenDep) -> LockData:
     """Get lock info."""
     return vault.get_lock_data(token=token)
 
 
-@app.post("/lock/{secrets_path:path}")
+@app.post("/v1/lock/{secrets_path:path}")
 async def acquire_lock(request: Request, vault: VaultDep, token: TokenDep) -> None:
     """Acquire the lock for Terraform state."""
     data = await request.json()
     return vault.acquire_lock(token=token, lock_data=data)
 
 
-@app.delete("/lock/{secrets_path:path}")
+@app.delete("/v1/lock/{secrets_path:path}")
 async def release_lock(vault: VaultDep, token: TokenDep) -> None:
     """Acquire the lock for Terraform state."""
     return vault.release_lock(token=token)