2 files changed, 36 insertions, 0 deletions
diff --git a/routers/api/packages/api.go b/routers/api/packages/api.go
index 04b0c0ab08..ee1feb1414 100644
--- a/routers/api/packages/api.go
+++ b/routers/api/packages/api.go
@@ -119,6 +119,12 @@ func CommonRoutes(ctx gocontext.Context) *web.Route {
 					r.Get("/owners", cargo.ListOwners)
 				})
 			})
+			r.Get("/config.json", cargo.RepositoryConfig)
+			r.Get("/1/{package}", cargo.EnumeratePackageVersions)
+			r.Get("/2/{package}", cargo.EnumeratePackageVersions)
+			// Use dummy placeholders because these parts are not of interest
+			r.Get("/3/{_}/{package}", cargo.EnumeratePackageVersions)
+			r.Get("/{_}/{__}/{package}", cargo.EnumeratePackageVersions)
 		}, reqPackageAccess(perm.AccessModeRead))
 		r.Group("/chef", func() {
 			r.Group("/api/v1", func() {
diff --git a/routers/api/packages/cargo/cargo.go b/routers/api/packages/cargo/cargo.go
index 18c93d328a..b666bdde6c 100644
--- a/routers/api/packages/cargo/cargo.go
+++ b/routers/api/packages/cargo/cargo.go
@@ -4,6 +4,7 @@
 package cargo
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"strconv"
@@ -45,6 +46,35 @@ func apiError(ctx *context.Context, status int, obj interface{}) {
 	})
 }
 
+// https://rust-lang.github.io/rfcs/2789-sparse-index.html
+func RepositoryConfig(ctx *context.Context) {
+	ctx.JSON(http.StatusOK, cargo_service.BuildConfig(ctx.Package.Owner))
+}
+
+func EnumeratePackageVersions(ctx *context.Context) {
+	p, err := packages_model.GetPackageByName(ctx, ctx.Package.Owner.ID, packages_model.TypeCargo, ctx.Params("package"))
+	if err != nil {
+		if errors.Is(err, util.ErrNotExist) {
+			apiError(ctx, http.StatusNotFound, err)
+		} else {
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+
+	b, err := cargo_service.BuildPackageIndex(ctx, p)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	if b == nil {
+		apiError(ctx, http.StatusNotFound, nil)
+		return
+	}
+
+	ctx.PlainTextBytes(http.StatusOK, b.Bytes())
+}
+
 type SearchResult struct {
 	Crates []*SearchResultCrate `json:"crates"`
 	Meta   SearchResultMeta     `json:"meta"`