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source.go
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source.go
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// Package rest is an implementation of AssetSource which fetches assets from a REST server. It maintains
// a cache which can also be preloaded with assets.
package rest
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/nyaruka/goflow/assets"
"github.com/nyaruka/goflow/utils"
log "github.com/sirupsen/logrus"
)
const (
assetTypeChannel AssetType = "channel"
assetTypeField AssetType = "field"
assetTypeFlow AssetType = "flow"
assetTypeGroup AssetType = "group"
assetTypeLabel AssetType = "label"
assetTypeLocationHierarchy AssetType = "location_hierarchy"
assetTypeResthook AssetType = "resthook"
)
// ServerSource is an asset source which fetches assets from a server and caches them
type ServerSource struct {
authToken string
typeURLs map[AssetType]string
httpClient *utils.HTTPClient
cache *AssetCache
fetcher assetFetcher
}
var _ assets.AssetSource = (*ServerSource)(nil)
var _ assetFetcher = (*ServerSource)(nil)
// NewServerSource creates a new server asset source
func NewServerSource(authToken string, typeURLs map[AssetType]string, httpClient *utils.HTTPClient, cache *AssetCache) *ServerSource {
// TODO validate typeURLs are for registered types?
s := &ServerSource{authToken: authToken, typeURLs: typeURLs, httpClient: httpClient, cache: cache}
s.fetcher = s
return s
}
type serverSourceEnvelope struct {
TypeURLs map[AssetType]string `json:"type_urls"`
}
// ReadServerSource reads a server asset source fronm the given JSON
func ReadServerSource(authToken string, httpClient *utils.HTTPClient, cache *AssetCache, data json.RawMessage) (*ServerSource, error) {
envelope := &serverSourceEnvelope{}
if err := utils.UnmarshalAndValidate(data, envelope); err != nil {
return nil, fmt.Errorf("unable to read asset server: %s", err)
}
return NewServerSource(authToken, envelope.TypeURLs, httpClient, cache), nil
}
// Channels returns all channel assets
func (s *ServerSource) Channels() ([]assets.Channel, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeChannel, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.Channel)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
// Fields returns all field assets
func (s *ServerSource) Fields() ([]assets.Field, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeField, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.Field)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
// Flow returns the flow asset with the given UUID
func (s *ServerSource) Flow(uuid assets.FlowUUID) (assets.Flow, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeFlow, string(uuid))
if err != nil {
return nil, err
}
flow, isType := asset.(assets.Flow)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type for UUID '%s'", uuid)
}
return flow, nil
}
// Groups returns all group assets
func (s *ServerSource) Groups() ([]assets.Group, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeGroup, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.Group)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
// Labels returns all label assets
func (s *ServerSource) Labels() ([]assets.Label, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeLabel, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.Label)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
// Locations returns all location assets
func (s *ServerSource) Locations() ([]assets.LocationHierarchy, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeLocationHierarchy, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.LocationHierarchy)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
// Resthooks returns all resthook assets
func (s *ServerSource) Resthooks() ([]assets.Resthook, error) {
if _, supported := s.typeURLs[assetTypeResthook]; !supported {
return nil, nil
}
asset, err := s.getAsset(assetTypeResthook, "")
if err != nil {
return nil, err
}
set, isType := asset.([]assets.Resthook)
if !isType {
return nil, fmt.Errorf("asset cache contains asset with wrong type")
}
return set, nil
}
func (s *ServerSource) getAsset(itemType AssetType, itemUUID string) (interface{}, error) {
url, err := s.getAssetURL(itemType, itemUUID)
if err != nil {
return nil, err
}
return s.cache.getAsset(url, s.fetcher, itemType)
}
// getAssetURL gets the URL for a set of the given asset type
func (s *ServerSource) getAssetURL(itemType AssetType, itemUUID string) (string, error) {
url, found := s.typeURLs[itemType]
if !found {
return "", fmt.Errorf("asset type '%s' not supported by asset server", itemType)
}
if itemUUID != "" {
url = fmt.Sprintf("%s%s/", url, itemUUID)
}
return url, nil
}
// fetches an asset by its URL and parses it as the provided type
func (s *ServerSource) fetchAsset(url string, itemType AssetType) ([]byte, error) {
request, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
// set request headers
request.Header.Set("Authorization", fmt.Sprintf("Token %s", s.authToken))
// make the actual request
response, err := s.httpClient.Do(request)
if err != nil {
return nil, err
}
defer response.Body.Close()
log.WithField("asset_type", string(itemType)).WithField("url", url).Debugf("asset requested")
if response.StatusCode != 200 {
return nil, fmt.Errorf("request returned non-200 response (%d)", response.StatusCode)
}
if response.Header.Get("Content-Type") != "application/json" {
return nil, fmt.Errorf("request returned non-JSON response")
}
return ioutil.ReadAll(response.Body)
}