Never use /api/v1 from Gitea UI Pages (#19318)

Reusing `/api/v1` from Gitea UI Pages have pros and cons.
Pros:
1) Less code copy

Cons:
1) API/v1 have to support shared session with page requests.
2) You need to consider for each other when you want to change something about api/v1 or page.

This PR moves all dependencies to API/v1 from UI Pages.

Partially replace #16052

modules/context/api.go

@@ -191,22 +191,6 @@ func (ctx *APIContext) SetLinkHeader(total, pageSize int) {
 	}
 }
 
-// SetTotalCountHeader set "X-Total-Count" header
-func (ctx *APIContext) SetTotalCountHeader(total int64) {
-	ctx.RespHeader().Set("X-Total-Count", fmt.Sprint(total))
-	ctx.AppendAccessControlExposeHeaders("X-Total-Count")
-}
-
-// AppendAccessControlExposeHeaders append headers by name to "Access-Control-Expose-Headers" header
-func (ctx *APIContext) AppendAccessControlExposeHeaders(names ...string) {
-	val := ctx.RespHeader().Get("Access-Control-Expose-Headers")
-	if len(val) != 0 {
-		ctx.RespHeader().Set("Access-Control-Expose-Headers", fmt.Sprintf("%s, %s", val, strings.Join(names, ", ")))
-	} else {
-		ctx.RespHeader().Set("Access-Control-Expose-Headers", strings.Join(names, ", "))
-	}
-}
-
 // RequireCSRF requires a validated a CSRF token
 func (ctx *APIContext) RequireCSRF() {
 	headerToken := ctx.Req.Header.Get(ctx.csrf.GetHeaderName())

modules/context/context.go

@@ -10,6 +10,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"errors"
+	"fmt"
 	"html"
 	"html/template"
 	"io"
@@ -21,6 +22,7 @@ import (
 	"strings"
 	"time"
 
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
@@ -577,6 +579,22 @@ func (ctx *Context) Value(key interface{}) interface{} {
 	return ctx.Req.Context().Value(key)
 }
 
+// SetTotalCountHeader set "X-Total-Count" header
+func (ctx *Context) SetTotalCountHeader(total int64) {
+	ctx.RespHeader().Set("X-Total-Count", fmt.Sprint(total))
+	ctx.AppendAccessControlExposeHeaders("X-Total-Count")
+}
+
+// AppendAccessControlExposeHeaders append headers by name to "Access-Control-Expose-Headers" header
+func (ctx *Context) AppendAccessControlExposeHeaders(names ...string) {
+	val := ctx.RespHeader().Get("Access-Control-Expose-Headers")
+	if len(val) != 0 {
+		ctx.RespHeader().Set("Access-Control-Expose-Headers", fmt.Sprintf("%s, %s", val, strings.Join(names, ", ")))
+	} else {
+		ctx.RespHeader().Set("Access-Control-Expose-Headers", strings.Join(names, ", "))
+	}
+}
+
 // Handler represents a custom handler
 type Handler func(*Context)
 
@@ -780,3 +798,21 @@ func Contexter() func(next http.Handler) http.Handler {
 		})
 	}
 }
+
+// SearchOrderByMap represents all possible search order
+var SearchOrderByMap = map[string]map[string]db.SearchOrderBy{
+	"asc": {
+		"alpha":   db.SearchOrderByAlphabetically,
+		"created": db.SearchOrderByOldest,
+		"updated": db.SearchOrderByLeastUpdated,
+		"size":    db.SearchOrderBySize,
+		"id":      db.SearchOrderByID,
+	},
+	"desc": {
+		"alpha":   db.SearchOrderByAlphabeticallyReverse,
+		"created": db.SearchOrderByNewest,
+		"updated": db.SearchOrderByRecentUpdated,
+		"size":    db.SearchOrderBySizeReverse,
+		"id":      db.SearchOrderByIDReverse,
+	},
+}

modules/context/utils.go

@@ -0,0 +1,56 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import (
+	"net/url"
+	"strings"
+	"time"
+)
+
+// GetQueryBeforeSince return parsed time (unix format) from URL query's before and since
+func GetQueryBeforeSince(ctx *Context) (before, since int64, err error) {
+	qCreatedBefore, err := prepareQueryArg(ctx, "before")
+	if err != nil {
+		return 0, 0, err
+	}
+
+	qCreatedSince, err := prepareQueryArg(ctx, "since")
+	if err != nil {
+		return 0, 0, err
+	}
+
+	before, err = parseTime(qCreatedBefore)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	since, err = parseTime(qCreatedSince)
+	if err != nil {
+		return 0, 0, err
+	}
+	return before, since, nil
+}
+
+// parseTime parse time and return unix timestamp
+func parseTime(value string) (int64, error) {
+	if len(value) != 0 {
+		t, err := time.Parse(time.RFC3339, value)
+		if err != nil {
+			return 0, err
+		}
+		if !t.IsZero() {
+			return t.Unix(), nil
+		}
+	}
+	return 0, nil
+}
+
+// prepareQueryArg unescape and trim a query arg
+func prepareQueryArg(ctx *Context, name string) (value string, err error) {
+	value, err = url.PathUnescape(ctx.FormString(name))
+	value = strings.TrimSpace(value)
+	return
+}