Remove custom template logic

This commit removes custom template logic in the entire distillery
codebase.

internal/dis/component/triplestore/create-repo.tpl

@@ -1,6 +1,5 @@
 # This file is used to initialize a new GraphDB repository. 
-# In this file the variables ${GRAPHDB_REPO} and ${INSTANCE_DOMAIN} will be replaced. 
-# All other variables will be left untouched. 
+# It is filled at runtime.
 
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
 @prefix rep: <http://www.openrdf.org/config/repository#>.
@@ -9,8 +8,8 @@
 @prefix owlim: <http://www.ontotext.com/trree/owlim#>.
 
 [] a rep:Repository ;
-    rep:repositoryID "${GRAPHDB_REPO}" ;
-    rdfs:label "${INSTANCE_DOMAIN}" ;
+    rep:repositoryID "{{ .RepositoryID }}" ;
+    rdfs:label "{{ .Label }}" ;
     rep:repositoryImpl [
         rep:repositoryType "graphdb:SailRepository" ;
         sr:sailImpl [
@@ -18,7 +17,7 @@
 
             owlim:owlim-license "" ;
 
-            owlim:base-URL "http://${INSTANCE_DOMAIN}/" ;
+            owlim:base-URL "{{ .BaseURL }}" ;
             owlim:defaultNS "" ;
             owlim:entity-index-size "10000000" ;
             owlim:entity-id-size  "32" ;

internal/dis/component/triplestore/provision.go

@@ -5,11 +5,11 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"text/template"
 
 	_ "embed"
 
 	"github.com/FAU-CDI/wisski-distillery/internal/models"
-	"github.com/FAU-CDI/wisski-distillery/pkg/unpack"
 	"github.com/tkw1536/goprogram/exit"
 )
 
@@ -18,8 +18,20 @@ var errTripleStoreFailedRepository = exit.Error{
 	ExitCode: exit.ExitGeneric,
 }
 
-//go:embed create-repo.ttl
-var createRepoTTL []byte
+//go:embed create-repo.tpl
+var createRepoTpl string
+
+// Template for creating repositories.
+//
+// NOTE(twiesing): The template is not aware of SparQL syntax, thus this template is very unsafe.
+// And should only be used with KNOWN GOOD input.
+var creteRepoTemplate = template.Must(template.New("create-repo.tpl").Parse(createRepoTpl))
+
+type createRepoContext struct {
+	RepositoryID string
+	Label        string
+	BaseURL      string
+}
 
 func (ts *Triplestore) Provision(ctx context.Context, instance models.Instance, domain string) error {
 	return ts.CreateRepository(ctx, instance.GraphDBRepository, domain, instance.GraphDBUsername, instance.GraphDBPassword)
@@ -39,12 +51,11 @@ func (ts *Triplestore) CreateRepository(ctx context.Context, name, domain, user,
 
 	// prepare the create repo request
 	var createRepo bytes.Buffer
-
-	err := unpack.WriteTemplate(&createRepo, map[string]string{
-		"GRAPHDB_REPO":    name,
-		"INSTANCE_DOMAIN": domain,
-	}, bytes.NewReader(createRepoTTL))
-	if err != nil {
+	if err := creteRepoTemplate.Execute(&createRepo, createRepoContext{
+		RepositoryID: name,
+		Label:        domain,
+		BaseURL:      "http://" + domain + "/",
+	}); err != nil {
 		return err
 	}