1 files changed, 145 insertions, 0 deletions
diff --git a/pkg/eax/eax.go b/pkg/eax/eax.go
new file mode 100644
index 0000000..34f5702
--- /dev/null
+++ b/pkg/eax/eax.go
@@ -0,0 +1,145 @@
+// Package eax queries the EA App API.
+package eax
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"mime"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+type Client struct {
+	// The [net/http.Client] to use for requests. If not provided,
+	// [net/http.DefaultClient] is used.
+	Client *http.Client
+
+	// The UpdateMgr for requests which require version information.
+	UpdateMgr *UpdateMgr
+}
+
+var ErrVersionRequired = errors.New("client version is required for this endpoint")
+
+// PlayerID contains basic identifiers and names for a player.
+type PlayerID struct {
+	PD          uint64 // origin ID
+	PSD         uint64 // ?
+	DisplayName string // in-game name
+	Nickname    string // social name?
+}
+
+// PlayerByPd gets basic information about an Origin ID. If the player does not
+// exist, nil will be returned.
+func (c *Client) PlayerIDByPD(ctx context.Context, pd uint64) (*PlayerID, error) {
+	var obj struct {
+		PlayerByPD *struct {
+			PD          string `json:"pd"`
+			PSD         string `json:"psd"`
+			DisplayName string `json:"displayName"`
+			Nickname    string `json:"nickname"`
+		} `json:"playerByPd"`
+	}
+	if err := c.gql1(ctx, true, `query { playerByPd (pd: `+strconv.FormatUint(pd, 10)+`) { pd psd displayName nickname } }`, &obj); err != nil {
+		return nil, err
+	}
+	if obj.PlayerByPD == nil {
+		return nil, nil
+	}
+	res := &PlayerID{
+		DisplayName: obj.PlayerByPD.DisplayName,
+		Nickname:    obj.PlayerByPD.Nickname,
+	}
+	if s := obj.PlayerByPD.PD; s != "" {
+		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
+			res.PD = v
+		} else {
+			return res, fmt.Errorf("parse pd %q: %w", s, err)
+		}
+	}
+	if s := obj.PlayerByPD.PSD; s != "" {
+		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
+			res.PD = v
+		} else {
+			return res, fmt.Errorf("parse psd %q: %w", s, err)
+		}
+	}
+	return res, nil
+}
+
+// gql1 performs a basic GraphQL query.
+func (c *Client) gql1(ctx context.Context, ver bool, query string, out any) error {
+	req, err := c.req(ctx, ver, http.MethodGet, "https://service-aggregation-layer.juno.ea.com/graphql?query="+url.QueryEscape(query), nil)
+	if err != nil {
+		return err
+	}
+
+	resp, err := c.do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if mt, _, _ := mime.ParseMediaType(resp.Header.Get("Content-Type")); mt != "application/json" {
+		if resp.StatusCode != http.StatusOK {
+			return fmt.Errorf("response status %d (%s) with content-type %q", resp.StatusCode, resp.Status, mt)
+		}
+		return fmt.Errorf("unexpected content-type %q", mt)
+	}
+
+	buf, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+
+	var obj struct {
+		Data   json.RawMessage `json:"data"`
+		Errors []struct {
+			Message string `json:"message"`
+		} `json:"errors"`
+	}
+	if err := json.Unmarshal(buf, &obj); err != nil {
+		if resp.StatusCode != http.StatusOK {
+			return fmt.Errorf("response status %d (%s) with invalid json", resp.StatusCode, resp.Status)
+		}
+		return fmt.Errorf("invalid json resp: %w", err)
+	}
+	if len(obj.Errors) != 0 {
+		return fmt.Errorf("got %d errors, including %q", len(obj.Errors), obj.Errors[0].Message)
+	}
+	if err := json.Unmarshal([]byte(obj.Data), out); err != nil {
+		return fmt.Errorf("invalid json data: %w", err)
+	}
+	return nil
+}
+
+func (c *Client) do(r *http.Request) (*http.Response, error) {
+	if c.Client == nil {
+		return http.DefaultClient.Do(r)
+	}
+	return c.Client.Do(r)
+}
+
+func (c *Client) req(ctx context.Context, ver bool, method, url string, body io.Reader) (*http.Request, error) {
+	req, err := http.NewRequestWithContext(ctx, method, url, body)
+	if err == nil {
+		if ver {
+			if c.UpdateMgr == nil {
+				return nil, ErrVersionRequired
+			}
+			ver, _, err := c.UpdateMgr.Update(false)
+			if err != nil {
+				return nil, fmt.Errorf("%w: failed to update version: %v", ErrVersionRequired, err)
+			}
+			if ver == "" {
+				return nil, ErrVersionRequired
+			}
+			req.Header.Set("User-Agent", "EADesktop/"+ver)
+		}
+		req.Header.Set("x-client-id", "EAX-JUNO-CLIENT")
+	}
+	return req, err
+}