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package lib
import (
"encoding/json"
"fmt"
"strings"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2"
"go.starlark.net/starlark"
)
// ResponderModule represents a module that satisfies the caddyhttp handler.
type ResponderModule struct {
Name string
Cfg json.RawMessage
Instance caddyhttp.Handler
}
func (r ResponderModule) Freeze() {}
func (r ResponderModule) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: responder module") }
func (r ResponderModule) String() string { return "responder module" }
func (r ResponderModule) Type() string { return "responder module" }
func (r ResponderModule) Truth() starlark.Bool { return true }
// Middleware represents a module that satisfies the starlark Value interface.
type Middleware struct {
Name string
Cfg json.RawMessage
Instance caddyhttp.MiddlewareHandler
}
func (r Middleware) Freeze() {}
func (r Middleware) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: middleware") }
func (r Middleware) String() string { return "middleware" }
func (r Middleware) Type() string { return "middleware" }
func (r Middleware) Truth() starlark.Bool { return true }
// LoadMiddleware represents the method exposed to starlark to load a Caddy module.
type LoadMiddleware struct {
Middleware Middleware
Ctx caddy.Context
}
func (r LoadMiddleware) Freeze() {}
func (r LoadMiddleware) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: loadMiddleware") }
func (r LoadMiddleware) String() string { return "loadMiddleware" }
func (r LoadMiddleware) Type() string { return "function: loadMiddleware" }
func (r LoadMiddleware) Truth() starlark.Bool { return true }
// Run is the method bound to the starlark loadMiddleware function.
func (r *LoadMiddleware) Run(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var name string
var cfg *starlark.Dict
err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 2, &name, &cfg)
if err != nil {
return starlark.None, fmt.Errorf("unpacking arguments: %v", err.Error())
}
js := json.RawMessage(cfg.String())
if strings.Index(name, "http.handlers.") == -1 {
name = fmt.Sprintf("http.handlers.%s", name)
}
inst, err := r.Ctx.LoadModule(name, js)
if err != nil {
return starlark.None, err
}
mid, ok := inst.(caddyhttp.MiddlewareHandler)
if !ok {
return starlark.None, fmt.Errorf("could not assert as middleware handler")
}
m := Middleware{
Name: name,
Cfg: js,
Instance: mid,
}
r.Middleware = m
return m, nil
}
// LoadResponder represents the method exposed to starlark to load a Caddy middleware responder.
type LoadResponder struct {
Module ResponderModule
Ctx caddy.Context
}
func (r LoadResponder) Freeze() {}
func (r LoadResponder) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: loadModule") }
func (r LoadResponder) String() string { return "loadModule" }
func (r LoadResponder) Type() string { return "function: loadModule" }
func (r LoadResponder) Truth() starlark.Bool { return true }
// Run is the method bound to the starlark loadResponder function.
func (r *LoadResponder) Run(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var name string
var cfg *starlark.Dict
err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 2, &name, &cfg)
if err != nil {
return starlark.None, fmt.Errorf("unpacking arguments: %v", err.Error())
}
js := json.RawMessage(cfg.String())
if strings.Index(name, "http.handlers.") == -1 {
name = fmt.Sprintf("http.handlers.%s", name)
}
inst, err := r.Ctx.LoadModule(name, js)
if err != nil {
return starlark.None, err
}
res, ok := inst.(caddyhttp.Handler)
if !ok {
return starlark.None, fmt.Errorf("could not assert as responder")
}
m := ResponderModule{
Name: name,
Cfg: js,
Instance: res,
}
r.Module = m
return m, nil
}
// Execute represents the method exposed to starlark to build a middleware chain.
type Execute struct {
Modules []Middleware
}
func (r Execute) Freeze() {}
func (r Execute) Hash() (uint32, error) { return 0, fmt.Errorf("unhashable: execute") }
func (r Execute) String() string { return "execute" }
func (r Execute) Type() string { return "function: execute" }
func (r Execute) Truth() starlark.Bool { return true }
// Run is the method bound to the starlark execute function.
func (r *Execute) Run(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
var mids *starlark.List
err := starlark.UnpackPositionalArgs(fn.Name(), args, kwargs, 1, &mids)
if err != nil {
return starlark.None, fmt.Errorf("unpacking arguments: %v", err.Error())
}
for i := 0; i < mids.Len(); i++ {
val, ok := mids.Index(i).(Middleware)
if !ok {
return starlark.None, fmt.Errorf("cannot get module from execute")
}
r.Modules = append(r.Modules, val)
}
return starlark.None, nil
}
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