Added goals, cache and func to get any remote obj

Cache is for storage, also includes pooled encoders and decoders
goals are things to eventually add to Linstrom

ap/getRemoteUser.go

@@ -1,11 +1,17 @@
 package ap
 
 import (
+	"errors"
+	"fmt"
+	"io"
 	"net/http"
+	"time"
 
 	"gitlab.com/mstarongitlab/goap"
 )
 
+var ErrNoApUrl = errors.New("no Activitypub url in webfinger")
+
 func GetRemoteUser(fullHandle string) (goap.BaseApChain, error) {
 	webfinger, err := GetAccountWebfinger(fullHandle)
 	if err != nil {
@@ -18,10 +24,62 @@ func GetRemoteUser(fullHandle string) (goap.BaseApChain, error) {
 			apUrl = *link.Href
 		}
 	}
+	if apUrl == "" {
+		return nil, ErrNoApUrl
+	}
 	apRequest, err := http.NewRequest("GET", apUrl, nil)
 	if err != nil {
 		return nil, err
 	}
 	apRequest.Header.Add("Accept", "application/activity+json,application/ld+json,application/json")
-	return nil, nil
+	client := http.Client{Timeout: time.Second * 30}
+	res, err := client.Do(apRequest)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode != 200 {
+		return nil, fmt.Errorf("bad status code: %d", res.StatusCode)
+	}
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+	apObject, _ := goap.Unmarshal(body, nil, nil)
+	// Check if Id exists
+	if _, ok := goap.FindAttribute[*goap.UDIdData](apObject); !ok {
+		return nil, fmt.Errorf("missing attribute for account: Id")
+	}
+	// Check that it has the correct object type for an account
+	if objTypePtr, ok := goap.FindAttribute[*goap.UDTypeData](apObject); !ok {
+		return nil, fmt.Errorf("missing attribute for account: Type")
+	} else if objType := *objTypePtr; objType.Type != goap.KEY_ACTIVITYSTREAMS_ACTOR {
+		return nil, fmt.Errorf("wrong ap object type: %s", objType.Type)
+	}
+	// And finally check for inbox
+	if _, ok := goap.FindAttribute[*goap.W3InboxData](apObject); !ok {
+		return nil, fmt.Errorf("missing attribute for account: Inbox")
+	}
+	return apObject, nil
+}
+
+func GetRemoteObject(target string) (goap.BaseApChain, error) {
+	apRequest, err := http.NewRequest("GET", target, nil)
+	if err != nil {
+		return nil, err
+	}
+	apRequest.Header.Add("Accept", "application/activity+json,application/ld+json,application/json")
+	client := http.Client{Timeout: time.Second * 30}
+	res, err := client.Do(apRequest)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode != 200 {
+		return nil, fmt.Errorf("bad status code: %d", res.StatusCode)
+	}
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+	apObject, _ := goap.Unmarshal(body, nil, nil)
+	return apObject, nil
 }