genai-toolbox/internal/tools/cloudhealthcare/cloudhealthcaregetfhirstore/cloudhealthcaregetfhirstore.go

// Copyright 2025 Google LLC
//
// 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.

package getfhirstore

import (
	"context"
	"fmt"

	"github.com/goccy/go-yaml"
	"github.com/googleapis/genai-toolbox/internal/sources"
	healthcareds "github.com/googleapis/genai-toolbox/internal/sources/cloudhealthcare"
	"github.com/googleapis/genai-toolbox/internal/tools"
	"github.com/googleapis/genai-toolbox/internal/tools/cloudhealthcare/common"
	"google.golang.org/api/healthcare/v1"
)

const kind string = "cloud-healthcare-get-fhir-store"

func init() {
	if !tools.Register(kind, newConfig) {
		panic(fmt.Sprintf("tool kind %q already registered", kind))
	}
}

func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
	actual := Config{Name: name}
	if err := decoder.DecodeContext(ctx, &actual); err != nil {
		return nil, err
	}
	return actual, nil
}

type compatibleSource interface {
	Project() string
	Region() string
	DatasetID() string
	AllowedFHIRStores() map[string]struct{}
	Service() *healthcare.Service
	ServiceCreator() healthcareds.HealthcareServiceCreator
	UseClientAuthorization() bool
}

// validate compatible sources are still compatible
var _ compatibleSource = &healthcareds.Source{}

var compatibleSources = [...]string{healthcareds.SourceKind}

type Config struct {
	Name         string   `yaml:"name" validate:"required"`
	Kind         string   `yaml:"kind" validate:"required"`
	Source       string   `yaml:"source" validate:"required"`
	Description  string   `yaml:"description" validate:"required"`
	AuthRequired []string `yaml:"authRequired"`
}

// validate interface
var _ tools.ToolConfig = Config{}

func (cfg Config) ToolConfigKind() string {
	return kind
}

func (cfg Config) Initialize(srcs map[string]sources.Source) (tools.Tool, error) {
	// verify source exists
	rawS, ok := srcs[cfg.Source]
	if !ok {
		return nil, fmt.Errorf("no source named %q configured", cfg.Source)
	}

	// verify the source is compatible
	s, ok := rawS.(compatibleSource)
	if !ok {
		return nil, fmt.Errorf("invalid source for %q tool: source kind must be one of %q", kind, compatibleSources)
	}

	parameters := tools.Parameters{}
	if len(s.AllowedFHIRStores()) != 1 {
		parameters = append(parameters, tools.NewStringParameter(common.StoreKey, "The FHIR store ID to get details for."))
	}
	mcpManifest := tools.GetMcpManifest(cfg.Name, cfg.Description, cfg.AuthRequired, parameters)

	// finish tool setup
	t := Tool{
		Name:           cfg.Name,
		Kind:           kind,
		Parameters:     parameters,
		AuthRequired:   cfg.AuthRequired,
		Project:        s.Project(),
		Region:         s.Region(),
		Dataset:        s.DatasetID(),
		AllowedStores:  s.AllowedFHIRStores(),
		UseClientOAuth: s.UseClientAuthorization(),
		ServiceCreator: s.ServiceCreator(),
		Service:        s.Service(),
		manifest:       tools.Manifest{Description: cfg.Description, Parameters: parameters.Manifest(), AuthRequired: cfg.AuthRequired},
		mcpManifest:    mcpManifest,
	}
	return t, nil
}

// validate interface
var _ tools.Tool = Tool{}

type Tool struct {
	Name           string           `yaml:"name"`
	Kind           string           `yaml:"kind"`
	AuthRequired   []string         `yaml:"authRequired"`
	UseClientOAuth bool             `yaml:"useClientOAuth"`
	Parameters     tools.Parameters `yaml:"parameters"`

	Project, Region, Dataset string
	AllowedStores            map[string]struct{}
	Service                  *healthcare.Service
	ServiceCreator           healthcareds.HealthcareServiceCreator
	manifest                 tools.Manifest
	mcpManifest              tools.McpManifest
}

func (t Tool) Invoke(ctx context.Context, params tools.ParamValues, accessToken tools.AccessToken) (any, error) {
	storeID, err := common.ValidateAndFetchStoreID(params, t.AllowedStores)
	if err != nil {
		return nil, err
	}

	svc := t.Service
	// Initialize new service if using user OAuth token
	if t.UseClientOAuth {
		tokenStr, err := accessToken.ParseBearerToken()
		if err != nil {
			return nil, fmt.Errorf("error parsing access token: %w", err)
		}
		svc, err = t.ServiceCreator(tokenStr)
		if err != nil {
			return nil, fmt.Errorf("error creating service from OAuth access token: %w", err)
		}
	}

	storeName := fmt.Sprintf("projects/%s/locations/%s/datasets/%s/fhirStores/%s", t.Project, t.Region, t.Dataset, storeID)
	store, err := svc.Projects.Locations.Datasets.FhirStores.Get(storeName).Do()
	if err != nil {
		return nil, fmt.Errorf("failed to get FHIR store %q: %w", storeName, err)
	}
	return store, nil
}

func (t Tool) ParseParams(data map[string]any, claims map[string]map[string]any) (tools.ParamValues, error) {
	return tools.ParseParams(t.Parameters, data, claims)
}

func (t Tool) Manifest() tools.Manifest {
	return t.manifest
}

func (t Tool) McpManifest() tools.McpManifest {
	return t.mcpManifest
}

func (t Tool) Authorized(verifiedAuthServices []string) bool {
	return tools.IsAuthorized(t.AuthRequired, verifiedAuthServices)
}

func (t Tool) RequiresClientAuthorization() bool {
	return t.UseClientOAuth
}