我试图通过Microsoft Exchange 2010服务器从C++应用程序发送电子邮件。为此,我使用EWS协议,使用库ews-cpp。通过EWS发送邮件:架构验证:无效的子元素“Body”
下面简单的例子,基于一个从https://github.com/otris/ews-cpp/blob/master/examples/send_message.cpp,失败(从我的实际代码剥离邮件地址和凭证):
#include <iostream>
#include <ews/ews.hpp>
struct {
std::string domain = "mailserver";
std::string username = "...";
std::string password = "...";
std::string server_uri = "https://mailserver/EWS/Exchange.asmx";
} env;
int main()
{
ews::set_up();
try
{
auto service = ews::service(env.server_uri, env.domain, env.username,
env.password);
service.set_request_server_version(ews::server_version::exchange_2010_sp2);
auto message = ews::message();
message.set_subject("Test mail from outer space");
std::vector<ews::mailbox> recipients;
recipients.push_back(ews::mailbox("..."));
message.set_to_recipients(recipients);
auto text = ews::body("This is a test.");
message.set_body(text);
service.create_item(message,
ews::message_disposition::send_and_save_copy);
}
catch (ews::schema_validation_error& exc)
{
std::cout << exc.what() << std::endl;
std::cout << exc.violation() << std::endl;
}
ews::tear_down();
return 0;
}
原始SOAP请求如下(由我添加的压痕) :
<m:CreateItem MessageDisposition="SendAndSaveCopy">
<m:Items>
<t:Message>
<t:Subject>Test mail from outer space</t:Subject>
<t:ToRecipients>
<t:Mailbox>
<t:EmailAddress>...</t:EmailAddress>
</t:Mailbox>
</t:ToRecipients>
<t:Body BodyType="Text">This is a test.</t:Body>
</t:Message>
</m:Items>
</m:CreateItem>
功能create_item
抛出ews::schema_validation_error
它被捕获在上述代码中,印刷:
The request failed schema validation
The element 'Message' in namespace ‘http://schemas.microsoft.com/exchange/services/2006/types’ has invalid child element 'Body' in namespace 'http://schemas.microsoft.com/exchange/services/2006/types'. List of possible elements expected: 'CcRecipients, BccRecipients, IsReadReceiptRequested, IsDeliveryReceiptRequested, ConversationIndex, ConversationTopic, From, InternetMessageId, IsRead, IsResponseRequested, References, ReplyTo, ReceivedBy, ReceivedRepresenting' in Namespace 'http://schemas.microsoft.com/exchange/services/2006/types'.
换句话说,EWS不希望<t:Body>
在<t:Message>
之内。
因此,当在SOAP请求中注销该元素(注释掉message.set_body(text)
)时,邮件会顺利发送。但是,没有身体的邮件没有多大意义,是吗?
我认为这个问题可能是因为ews-cpp
是为Exchange 2013编写的(并且在这方面2010年和2013年之间的架构发生了变化)。所以我深入到架构中,每个Exchange服务器在/ews/types.xsd
服务,以查看架构是否允许这样一个子元素。
在架构定义文件,我发现型MessageType
的定义(这是Message
元素,我们正在谈论的类型):
<xs:complexType name="MessageType">
<xs:complexContent>
<xs:extension base="t:ItemType">
<xs:sequence>
<xs:element name="Sender" minOccurs="0" type="t:SingleRecipientType"/>
<xs:element name="ToRecipients" type="t:ArrayOfRecipientsType" minOccurs="0"/>
<xs:element name="CcRecipients" type="t:ArrayOfRecipientsType" minOccurs="0"/>
<xs:element name="BccRecipients" type="t:ArrayOfRecipientsType" minOccurs="0"/>
<xs:element name="IsReadReceiptRequested" type="xs:boolean" minOccurs="0"/>
<xs:element name="IsDeliveryReceiptRequested" type="xs:boolean" minOccurs="0"/>
<xs:element name="ConversationIndex" type="xs:base64Binary" minOccurs="0"/>
<xs:element name="ConversationTopic" type="xs:string" minOccurs="0"/>
<xs:element name="From" type="t:SingleRecipientType" minOccurs="0"/>
<xs:element name="InternetMessageId" type="xs:string" minOccurs="0"/>
<xs:element name="IsRead" type="xs:boolean" minOccurs="0"/>
<xs:element name="IsResponseRequested" type="xs:boolean" minOccurs="0"/>
<xs:element name="References" type="xs:string" minOccurs="0"/>
<xs:element name="ReplyTo" type="t:ArrayOfRecipientsType" minOccurs="0"/>
<xs:element name="ReceivedBy" type="t:SingleRecipientType" minOccurs="0"/>
<xs:element name="ReceivedRepresenting" type="t:SingleRecipientType" minOccurs="0"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
正如你所看到的,有没有Body
孩子元素,但MessageType
是基于ItemType
,其定义如下(节选):
<xs:complexType name="ItemType">
<xs:sequence>
<xs:element name="MimeContent" type="t:MimeContentType" minOccurs="0"/>
<xs:element name="ItemId" type="t:ItemIdType" minOccurs="0"/>
<xs:element name="ParentFolderId" type="t:FolderIdType" minOccurs="0"/>
<xs:element name="ItemClass" type="t:ItemClassType" minOccurs="0"/>
<xs:element name="Subject" type="xs:string" minOccurs="0"/>
<xs:element name="Sensitivity" type="t:SensitivityChoicesType" minOccurs="0"/>
<xs:element name="Body" type="t:BodyType" minOccurs="0"/>
<xs:element name="Attachments" type="t:NonEmptyArrayOfAttachmentsType" minOccurs="0"/>
[...]
</xs:sequence>
</xs:complexType>
正如你所看到的,它接受Body
元素作为孩子。
请注意,Subject
元素也在ItemType
中定义,而不是在MessageType
中定义,并且EWS在上述代码段中接受该元素。
这个奇怪的验证失败的原因是什么?