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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| package finderhttpclient | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
|
|
||
| "github.com/ipni/go-indexer-core/store/dhash" | ||
| "github.com/ipni/storetheindex/api/v0/finder/model" | ||
| "github.com/ipni/storetheindex/api/v0/httpclient" | ||
| "github.com/libp2p/go-libp2p/core/peer" | ||
| b58 "github.com/mr-tron/base58/base58" | ||
| "github.com/multiformats/go-multihash" | ||
| ) | ||
|
|
||
| const ( | ||
| metadataPath = "/metadata" | ||
| ) | ||
|
|
||
| type DHashClient struct { | ||
| Client | ||
|
|
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| metadataUrl string | ||
| } | ||
|
|
||
| func NewDHashClient(baseURL string, options ...httpclient.Option) (*DHashClient, error) { | ||
| c, err := New(baseURL, options...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &DHashClient{ | ||
| Client: *c, | ||
| metadataUrl: baseURL + metadataPath, | ||
| }, nil | ||
| } | ||
|
|
||
| func (c *DHashClient) Find(ctx context.Context, mh multihash.Multihash) (*model.FindResponse, error) { | ||
| // query value keys from indexer | ||
| smh, err := dhash.SecondMultihash(mh) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| u := fmt.Sprint(c.finderURL, "/", smh.B58String()) | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, u, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| req.Header.Add("Accept", "application/json") | ||
|
|
||
| resp, err := c.c.Do(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| body, err := io.ReadAll(resp.Body) | ||
| defer resp.Body.Close() | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| return nil, httpclient.ReadError(resp.StatusCode, body) | ||
| } | ||
|
|
||
| findResponse := &model.FindResponse{} | ||
| err = json.Unmarshal(body, findResponse) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| c.decryptFindResponse(ctx, findResponse, map[string]multihash.Multihash{smh.B58String(): mh}) | ||
|
|
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| return findResponse, nil | ||
| } | ||
|
|
||
| // decryptFindResponse decrypts EncMultihashResults and appends the decrypted values to | ||
| // MultihashResults. It also fetches provider info and metadata for each value key. | ||
| func (c *DHashClient) decryptFindResponse(ctx context.Context, resp *model.FindResponse, unhasher map[string]multihash.Multihash) error { | ||
| pinfoCache := make(map[peer.ID]*model.ProviderInfo) | ||
|
|
||
| // decrypt each value key using the original multihash | ||
| // then for each decrypted value key fetch provider's addr info | ||
| for _, encRes := range resp.EncMultihashResults { | ||
| mh, found := unhasher[encRes.Multihash.B58String()] | ||
| if !found { | ||
| continue | ||
| } | ||
|
|
||
| mhr := model.MultihashResult{ | ||
| Multihash: mh, | ||
| } | ||
| for _, evk := range encRes.ValueKeys { | ||
| vk, err := dhash.DecryptValueKey(evk, mh) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| pid, ctxId, err := dhash.SplitValueKey(vk) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // fetch provider info to populate peer.AddrInfo | ||
| pinfo := pinfoCache[pid] | ||
| if pinfo == nil { | ||
| pinfo, err = c.GetProvider(ctx, pid) | ||
| if err != nil { | ||
| continue | ||
| } | ||
| pinfoCache[pid] = pinfo | ||
| } | ||
|
|
||
| // fetch metadata | ||
| metadata, err := c.fetchMetadata(ctx, vk) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| mhr.ProviderResults = append(mhr.ProviderResults, model.ProviderResult{ | ||
| ContextID: ctxId, | ||
| Metadata: metadata, | ||
| Provider: pinfo.AddrInfo, | ||
| }) | ||
| } | ||
| if len(mhr.ProviderResults) > 0 { | ||
| resp.MultihashResults = append(resp.MultihashResults, mhr) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *DHashClient) fetchMetadata(ctx context.Context, vk []byte) ([]byte, error) { | ||
| u := fmt.Sprint(c.metadataUrl, "/", b58.Encode(dhash.SHA256(vk, nil))) | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, u, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| req.Header.Add("Accept", "application/json") | ||
|
|
||
| resp, err := c.c.Do(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| body, err := io.ReadAll(resp.Body) | ||
| defer resp.Body.Close() | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if resp.StatusCode != http.StatusOK { | ||
| return nil, httpclient.ReadError(resp.StatusCode, body) | ||
| } | ||
|
|
||
| return dhash.DecryptMetadata(body, vk) | ||
| } |
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