You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sys_init.go
    path of file: ./repos/vault/http
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package http

import (
	"context"
	"encoding/base64"
	"encoding/hex"
	"fmt"
	"net/http"
	"strings"

	"github.com/hashicorp/vault/vault"
)

func handleSysInit(core *vault.Core) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case "GET":
			handleSysInitGet(core, w, r)
		case "PUT", "POST":
			handleSysInitPut(core, w, r)
		default:
			respondError(w, http.StatusMethodNotAllowed, nil)
		}
	})
}

func handleSysInitGet(core *vault.Core, w http.ResponseWriter, r *http.Request) {
	init, err := core.Initialized(context.Background())
	if err != nil {
		respondError(w, http.StatusInternalServerError, err)
		return
	}

	respondOk(w, &InitStatusResponse{
		Initialized: init,
	})
}

func handleSysInitPut(core *vault.Core, w http.ResponseWriter, r *http.Request) {
	ctx := context.Background()

	// Parse the request
	var req InitRequest
	if _, err := parseJSONRequest(core.PerfStandby(), r, w, &req); err != nil {
		respondError(w, http.StatusBadRequest, err)
		return
	}

	// Validate init request parameters
	if err := validateInitParameters(core, req); err != nil {
		respondError(w, http.StatusBadRequest, err)
		return
	}

	// Initialize
	barrierConfig := &vault.SealConfig{
		SecretShares:    req.SecretShares,
		SecretThreshold: req.SecretThreshold,
		StoredShares:    req.StoredShares,
		PGPKeys:         req.PGPKeys,
	}

	recoveryConfig := &vault.SealConfig{
		SecretShares:    req.RecoveryShares,
		SecretThreshold: req.RecoveryThreshold,
		PGPKeys:         req.RecoveryPGPKeys,
	}

	initParams := &vault.InitParams{
		BarrierConfig:   barrierConfig,
		RecoveryConfig:  recoveryConfig,
		RootTokenPGPKey: req.RootTokenPGPKey,
	}

	result, initErr := core.Initialize(ctx, initParams)
	if initErr != nil {
		if vault.IsFatalError(initErr) {
			respondError(w, http.StatusBadRequest, initErr)
			return
		} else {
			// Add a warnings field? The error will be logge
    
func handleSysInitPut(core *vault.Core, w http.ResponseWriter, r *http.Request) {
	ctx := context.Background()

	// Parse the request
	var req InitRequest
	if _, err := parseJSONRequest(core.PerfStandby(), r, w, &req); err != nil {
		respondError(w, http.StatusBadRequest, err)
		return
	}

	// Validate init request parameters
	if err := validateInitParameters(core, req); err != nil {
		respondError(w, http.StatusBadRequest, err)
		return
	}

	// Initialize
	barrierConfig := &vault.SealConfig{
		SecretShares:    req.SecretShares,
		SecretThreshold: req.SecretThreshold,
		StoredShares:    req.StoredShares,
		PGPKeys:         req.PGPKeys,
	}

	recoveryConfig := &vault.SealConfig{
		SecretShares:    req.RecoveryShares,
		SecretThreshold: req.RecoveryThreshold,
		PGPKeys:         req.RecoveryPGPKeys,
	}

	initParams := &vault.InitParams{
		BarrierConfig:   barrierConfig,
		RecoveryConfig:  recoveryConfig,
		RootTokenPGPKey: req.RootTokenPGPKey,
	}

	result, initErr := core.Initialize(ctx, initParams)
	if initErr != nil {
		if vault.IsFatalError(initErr) {
			respondError(w, http.StatusBadRequest, initErr)
			return
		} else {
			// Add a warnings field? The error will be logged in the vault log
			// already.
		}
	}

	// Encode the keys
	keys := make([]string, 0, len(result.SecretShares))
	keysB64 := make([]string, 0, len(result.SecretShares))
	for _, k := range result.SecretShares {
		keys = append(keys, hex.EncodeToString(k))
		keysB64 = append(keysB64, base64.StdEncoding.EncodeToString(k))
	}

	resp := &InitResponse{
		Keys:      keys,
		KeysB64:   keysB64,
		RootToken: result.RootToken,
	}

	if len(result.RecoveryShares) > 0 {
		resp.RecoveryKeys = make([]string, 0, len(result.RecoveryShares))
		resp.RecoveryKeysB64 = make([]string, 0, len(result.RecoveryShares))
		for _, k := range result.RecoveryShares {
			resp.RecoveryKeys = append(resp.RecoveryKeys, hex.EncodeToString(k))
			resp.RecoveryKeysB64 = append(resp.RecoveryKeysB64, base64.StdEncoding.EncodeToString(k))
		}
	}

	if err := core.UnsealWithStoredKeys(ctx); err != nil {
		respondError(w, http.StatusInternalServerError, err)
		return
	}

	respondOk(w, resp)
}