price pipeline

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

internal/pipeline/openfigi.go

@@ -0,0 +1,75 @@
+package pipeline
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+// exchSuffix mappe le code bourse OpenFIGI vers le suffixe Yahoo Finance
+var exchSuffix = map[string]string{
+	"FP": ".PA", // Euronext Paris
+	"GY": ".DE", // Xetra
+	"LN": ".L",  // London
+	"SM": ".MC", // Madrid
+	"IM": ".MI", // Milan
+	"NA": ".AS", // Amsterdam
+	"BB": ".BR", // Bruxelles
+	"UN": "",    // NYSE
+	"UQ": "",    // NASDAQ
+	"UW": "",    // NASDAQ (alt)
+}
+
+type openFIGIRequest struct {
+	IDType  string `json:"idType"`
+	IDValue string `json:"idValue"`
+}
+
+type openFIGIData struct {
+	Ticker   string `json:"ticker"`
+	ExchCode string `json:"exchCode"`
+	Name     string `json:"name"`
+}
+
+type openFIGIResult struct {
+	Data  []openFIGIData `json:"data"`
+	Error string         `json:"error"`
+}
+
+// ResolveISIN résout un ISIN en ticker Yahoo Finance via OpenFIGI.
+func ResolveISIN(ctx context.Context, apiKey, isin string) (string, error) {
+	body, _ := json.Marshal([]openFIGIRequest{{IDType: "ID_ISIN", IDValue: isin}})
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		"https://api.openfigi.com/v3/mapping", bytes.NewReader(body))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	if apiKey != "" {
+		req.Header.Set("X-OPENFIGI-APIKEY", apiKey)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	var results []openFIGIResult
+	if err := json.NewDecoder(resp.Body).Decode(&results); err != nil {
+		return "", fmt.Errorf("decode openfigi response: %w", err)
+	}
+	if len(results) == 0 || len(results[0].Data) == 0 {
+		return "", fmt.Errorf("no result for ISIN %s", isin)
+	}
+	if results[0].Error != "" {
+		return "", fmt.Errorf("openfigi error: %s", results[0].Error)
+	}
+
+	d := results[0].Data[0]
+	suffix := exchSuffix[d.ExchCode]
+	return d.Ticker + suffix, nil
+}